Hey Lilred. Glad ya got a crossbow. I happen to have one although I don't use it to hunt with now. It was my father in laws. He got it when he was 93 cause he couldn't pull a bow and wanted to hunt deer. Even got one with it too(at 95). When we shot that darn thing we found out a lot of stuff. First and foremost is is still a bow. Ranges for shooting aren't necessarily extended so keep it under 40 yds. The one thing that a cross bow does do is make it a little easier to hit with. It is a pain to cock and takes more time than a regular bow for the 2nd shot. Almost like using a muzzleloader. We put a crank on it for him. Darn thing is heavy too. Your 90 gr broadheads will be just fine. We used mechanicals for my FIL's and they worked fine. Shot good too. To be really honest when I was shooting a bow regularly(100 arrows a day with my recurve) I could shot 3 times as fast and more accurately but that ol crossbow will work out pretty well for ya. You still have to PRACTICE religiously. Go get 'em kid. You will have fun. What'cha putting in the food plot kiddo??
Oh BTW hold it tight when ya shoot it. They do have a bit of recoil. Bruised my FIL pretty badly...but he was using coumadin to thin his blood. Didn't stop him though