A wrist strap allows you to correctly hold your bow loosely without dropping it after the shot. It's an important item to obtain good form. A stabilizer can also make a bigger difference to your accuracy than even your choice in arrow (brand/style, spine and length are still more important)

Right now if you patrol the sporting goods aisle at Wall mart you might be able to pick up a strap for about $5 and a stabilizer for maybe $10. You don't need anything fancy, just something that will put a little mass away from center. The strap doesn't need to be anything fancy either.

I'd also suggest giving yourself a bit more than 2 or 3 months if you've never bow hunted before. You want to be as confident as possible in your abilities