I'm looking to purchase my first ever compound bow at age 46 in order to learn how to shoot with my 6 (soon to be 7) year old son.

Because of funds (or a lack there of) it looks as though I'm going to be going with a used bow for myself.

I know absolutely nothing about bows so can someone please give me some specifics that I should be looking for when I find a used bow so I'll know if it is something I should consider? (ie: What should I be looking for as far as.....draw weight? draw length? axle to axle? let off? max speed? sight vs no sight? material made from? brands? size? etc)

I'm 6'2", 193 pounds, not very strong, have very little money (I mean I'm looking for under $100), and right now I'm looking for something to just learn how to shoot in the backyard with my son. If we both fall in love with it then maybe doing some hunting (although right now he doesn't like camo so we'll have to work around that).

I appreciate any and all help/advice.

TripleB