Most shops will do a consignment sell for your old bow - but each shop is different.

Some things that are often overlooked when you buy a new bow and often result in buying "upgrades" later (better to get it as close to right from the start instead of constantly upgrading your accessories).

Sight Size: A lot of people will see the nice bright large pins in a cheaper sight and think it's great. But with some of these new bows, 40+ yard shots are not that uncommon. So a smaller fiber size is always better. I personally wouldn't recommend anything larger than .019

Peep Sight size: Most people just "deal" with whatever peep the shop puts on there. This really isn't the best way to do it. Once you get a solid stance and anchor point, when you look through the peep you should just barely be able to see the sight edges (the round part that protects the pins). If you see too much of it, it'll be harder to get a quick "center" and if you can't see it at all, you'll have a hard time staying consistent with putting the pins in the middle of the peep in the exact same spot every time.

With a high speed bow, pre-think and ask for recommendations on your arrows. Don't be afraid to spend a little extra - it's absolutely worth it. Additionally, if you know you’re going to shoot fixed blades, go for a slight offset fletching (1 deg). If you’re going to use mechanical with little chance them affecting the flight, go with right-Helical.

Get the shop that sets your bow up to agree to verify tune after 4-5 dozen arrows being shot. 99.9% of the time it won't change anything, but it's always better to give the strings time to relax and form before getting a solid tuning.

If you need more info, PM me and I’ll help the best I can and give you some