So I am building a 10' x 2' 300dpi sign for my buddies restaurant. I have never prepared anything that large for print (I'm mostly a web developer). I have my freaking huge psd, 120in by 24in, 300dpi, it wants to save as a .psb. Once that occurs, I no longer have the option to save or export as pdf from photoshop, only .tif and one other format.
Would someone mind educating me? I have not been able to find the correct answer after a couple hours of googling.