This depends, on the way you made the fonts.
Font forge can load your letters, but you need to export them in a format that it can read. I suggest using EPS, although SVG can also work out fine. You need to export each letter separately. You can make the process faster if you save each letter in a file named uni####.eps where the #### is a Unicode code for the letter. You can then load things in as a EPS template and don't need to load each letter separately.
Now, if your font is made out of pure lines, that do not form a closed area. Then most applications can not use the font as is. You need to make it such that each letter is closed. You can either do this in autocad or FontForge.
Now if you want a font native to autocad called made out of lines called SHX. I suggest you do this for line fonts. Then read this I will try it and test it later.