RE: bruise marks
Archery shouldn't be a hazardous sport. You're going to really hurt yourself unless you get PROfessional help quickly.
If you're hitting your elbow, you've got some serious form and fit problems. Your best and safestway to fix it is to let someone, who knows what they're doing, examine everything. If your archery shop let you walk out the door with that set-up, go back and demand that they do it correctly. I hope that they are a PRO Shop and not just an archery retailer.
Good luck.