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I'm pretty new to all this so bear with me.
I want to print a portfolio for a school assignment and I want it to be saddle-stitch binding. I also want the Portfolio to be A4 landscape. I've seen a lot of A4 portrait saddle stitch options but not any for landscape. I did a test run. It ended up cutting the pages in half to fit a portrait template. Any suggestions on how to fix this? 
also when printing is there a specific paper size I need to get to achieve this specific design.
thank you.
Here's a solution.
Resize the width so it fits within A3/A3+ longer side size (420/450mm).
The printers can not print to the edge, so you need to subtract 1cm from the width. Now you get a maximum width of 440mm. Let that be your longer side. Resize the shorter side proportionally.
You will end up with your original design scaled down for some percentage.
Remember to arrange your pages properly.
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You want to print an A4 landscape saddle stitch booklet.
Let's make sure we use the same terminology here:
Landscape means a format which is wider than it's tall.
A4 landscape has the dimensions 297 x 210 mm.
Saddle stitch is a binding method where you print properly imposed spreads, layer the printed sheets on top of each other, stitch the sheets together, fold the sheets on the middle along the spine and finally cut the booklet down to the trim size.
I don't think the problems you are facing has anything to do with any setting in InDesign or on your printer. Most home or office printers simply can't print on sheets large enough for this to work.
Including bleed, the width of the spreads you want to print is 3 + 297 + 297 + 3 = 600 mm, and the height is 3 + 210 + 3 = 216 mm.
Let's try to overlay the common paper formats:
As you see, the smallest paper format which is large enough to contain the spreads including bleed is SRA2 (640 x 450 mm). Many home printers can only print A4, office printers can often print up to SRA3, but to print larger than that, you probably need to go to a commercial print shop.
So in my opinion you have the following options:
If you have a little money: Order a print from a commercial print shop. This is easy. You just deliver a single page PDF and receive a finished A4 landscape saddle stitch booklet.
If you have access to a printer which can print on SRA4, A3 or SRA3: Print single pages front/back and cut them to the trim size. Find another way to bind them. For example stitch them from the the front, find a place to make a wire-o or use a some kind of plastic spine from an office supply store.
If you only have access to a printer which can print on A4: Print at slightly reduced size to be able to include the bleed and do as above.
One can, fairly easily, create a horizontal document with binding on the long edge to allow vertical flipping of pages with InDesign. It merely requires one to think a bit different about the overall configuration/set up of document pages and their contents.
Merely rotate the horizontal contents of a page so it's vertical. Or set up a vertical document and then use the page display options to display the pages rotated 90°.
Basically, set up a vertical book with the page contents rotated. That allows you to use the "print booklet" command and get a landscape book.
This will use non-facing pages that are set in spreads, but it works the same for facing pages. Here is a standard configuration for a traditional saddle-stitched book:
The stitching occurs on the long edge.
Problem: The contents of the pages are vertical. The desire is to have the contents running horizontal, but keep stitching on the long edge, so the final stitched booklet will flip vertically, like a calendar. Like so...
https://www.presentermedia.com/powerpoint-animation/custom-calendar-flip-pid-19010
Note the binding, in this case ring binding, is on the long edge. So that's what you need to accomplish with the set up.
In InDesign, highlight the spread in the Pages Panel and from the Pages Panel menu, choose Page Attributes > Rotate Spread View > 90° CW
This will rotate what you see and not any aspect of the layout or construction. This merely shows you a rotated preview rather than the actual vertical preview.
Note the Pages Panel above - the spreads are all still vertical but there's a little "rotate" icon next to the spread to indicate you are viewing it rotated.
Now, simply rotate the page contents to match the spread rotation...
You can then output this file like any standard booklet set up and it will be bound on the long edge and allow for the "calendar-like" flipping vertical.
For demonstration purposes, you can remove the preview rotation at any time by choosing Page Attributes > Rotate Spread View > Clear Rotation from the Pages Panel menu...
And you're back to a standard preview, but now the contents of pages are rotated to match the desired output:
Note that you don't need to remove the rotation once it's been implemented. It's fine to leave the spreads with the rotated preview, they will still output as if they were vertical.
This is all simply a way to alter what you see in order to work more efficiently but still allow standard vertical output in order to allow the "print booklet" command to create a proper PDF for saddle stitching.
If the desire is to have binding on the short edge, there's no need for any custom set up with respect to binding. Merely create document pages which are wider than they are tall. Issues may arise here due to limitations of any output/bindery device - but the "print booklet" command will still create a PDF with anticipated binding on the short edge. For more clarity here, see the answer from @Wolff, where he addresses possible issues with short edge binding.
