You have certainly taken up a challenge and the fact that you hurried to buy a bow that probably isn't even remotely close to properly fitting you may seriously complicate matters. You could be in for some very frustrating shooting. My best advice is that you MUST seek out advice from an experienced bowhunter and preferably a Pro Shop in your area. These Shops are extremely valuable for properly fitting equipment and making sure you have the right equipment and correctly spined arrows. You need help and it's the kind that you're not going to get from an internet forum.
Good luck and good shootin'