I am curious to know how armies were raised and how many soldiers could be raised within a certain area, based on the population of the area, without disrupting and/or destroying the economy of the area?
And what kind of training did the soldiers receive, both the regular/conscripted soldiers (peasants), the more professional soldiers (standing army) and the knights.
I am more curious about the 11th-15 century period in Europe.
Ah, yes, Medieval armies, one of my favourite topics. As always, if anyone has more to offer on this matter, please don't let this stop you from posting! For the meantime, OP, we can turn to my Medieval Armies Compilation of many and varied posts. You may as well get most of the thing as it is now. Most useful to you, I think, will be the posts of u/Goiyon on the military affairs of Holland:
As regards composition, I should note that your premise of 'regular/conscripted soldiers, more professional soldiers, and knights' is...kind of there, kind of not. For this, we look to u/Rittermeister, and these two posts on just what 'peasant' means for purposes of Medieval armies.
On the specific matter of training, see next post.