You probably want between 13 and 16 tunes on there. It's best to shoot for the higher number of songs so that if you have to throw out one or two that aren't up to snuff then you still have enough to satisfy their appetite for new and good music.
For my next album I've created a scheme with a variety of forms for the first 10. In pop music the A section is the verse the B section is the chorus the C section is the bridge. I also use T for transition and R for Rise which is also known as a prechorus.
The schemes are; ABACDCABA, ABABCAB, ABCDABCDABCD, ABCABCABC, ABTABTCAB, ABABTCAB, ABTABCAB, ARBTARBTCARB, ARBARBTCARB, ARBTARBCARB.
There's variety and it's in the complexity ball park. Also, each one of these songs should either start on a different note, be in a different key or use a different kind of scale.
For now you can just randomly assign keys either just going up the scale as in; the first tune starts on C the second tune is in D the third tune is in E etc... Or you can use dice to decide which tune starts on what note.
The only comment I can make here is not to put the climax of your album in the key of D if you're a solo guitarist unless you can play it with the E string tuned down to D or otherwise you won't have the guitar's beautiful low register to give the tune some oomph.
We're starting to close in on the details. What are you going to do with those sections of music?
Usually the chorus starts on the downbeat and on an important note of the key/scale. That's usually the 1st note/tonic but may also be the 3rd or 5th in that order.
I haven't seen any books cover this point except the Berklee book on Popular Melody Writing. Period. Finished. It's the only one and I've read A LOT.
