The best advice I could give you is to start out with an inexpensive used bow. One that is 40#'s at your draw legth. If 28" with a compound it will be 26 to 27 with a trad bow. Practice with that set up before moving onto a new custom bow. Work on your form before worrying about hitting a bullseye at 20 yards.

Start at 10 yards with a blank target. Just practice good form until it becomes natural. Then, practice by tossing a tennis ball in a field and shooting two arrows at it with judo points or an ace small game head. Retrieve and do it over and over. That's the best practice for instinctive shooting.