Couple of ideas:
"doesn't come when I call her"
- Try being super excited in your voice and animated with your body!! Maybe have treats or toys in your hands! And you can try to run backwards too, which usually gets a pup to want to chase you! Also, she might not know her name yet, so keep saying her name and praise her if she even looks at you when you say it.
"She is hyper and plays very rough and I cant get her to stop biting/chewing on our hands, feet, etc. she of course doesn't bite hard, but puppy teeth are very sharp and she has drawn blood"
- Normal puppy behavior and normal sharp puppy teeth! You said you had her two weeks and she is 8 weeks, if you brought her home at 6 weeks, that is a little bit young. Puppies learn a TON from other puppies in the litter up to the 8 week point on how hard to bite, etc. You need to teach just like other puppies would - bite too hard, give a loud 'yelp! or ouch!' and end the play for a few minutes. From my experience some puppies pick up on that right away, others get more roudy and bite more! So walking away and ignoring for maybe 3 minutes (a lifetime for a puppy!) will help a lot, but it takes a bunch of times to sink in - bite means no more playtime.
"I have tried several tactics and nothing is working as of yet. When I tell her no she barks and growls at me and gets more excited like I'm playing with her"
- At this point, she doesn't know what human words mean, she probably thinks you are making play sounds like other puppies - physically removing yourself when she does things you don't want will get the point across faster. But, you will be surprised, by 7 months, boxers know SO SO SO many words, its kinda crazy! Some words you didn't even teach them, and they just seem to know them! The important thing in the beginning is using clear concise words repeatedly - no, sit, down, stay, etc. - they don't understand when we start using tons of words.
" When she chews on things I tell her no and give her one of her toys. "
- keep this up! it will pay off after a bunch of tries!
"Is she too young to worry about the other stuff?"
- In my experience they are never too young to try to teach - but each will respond differently. Some puppies can be taught 'sit, down, stay, roll-over, etc.' by 10 weeks old, others are more hyper and have shorter attention spans and will learn these by 4 months or later. Just takes patience, repetition, and super over the top praise when they actually do what you are asking!! Treat them like they laid a golden egg worth billions when they do what you were trying to teach!
Hope that helps!! And enjoy your new little one!!!!!!!
Jenny