Where are the rules for generating magic spells?

I downloaded the rulebook in three parts. I've searched through them all, but I'm unable to find this. It says in the magic section that you must roll randomly to see what kind of spells your wizard has. However, i could not find how many spells they start with. Or if they will gain new spells from experience. Can somebody point me to where this is mentioned in the rulebooks?

Pages listed are from the printed rulebook, not sure if they are the same in the download.

Relevant pages:

P56. Allocated Spells [EDIT: P40 Part 1 (Rules)]

P121. Advance Rolls [EDIT: P82 Part 3 (Campaigns)]

Okay... it's still not very clear to me. But this is what I got. When you first create a wizard, they only know one spell, which you roll for randomly. Then when they would gain a skill, you can instead choose to roll again for a new spell, correct?

That is correct.

Yes, and if you roll the same spell twice, you can choose to lower it's difficulty by 1 or re-roll

Okay, thanks a lot.

Note, some casters start with more than one spell, though that is explicitly stated for those cases =]