Daym! Hopefully this forum will not be used much, though should you have an injury or want more information on prevention check in here.
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Overtraining can be more detrimental than not training at all. This link has some good, basic information about overtraining on a molecular level through to ways you can check if you're overtraining yourself.
I think the main thing for beginners to look out for with bodyweight training (particularly straight arm work) is tendonitis. In daily life, you don't put as much strain on your tendons compared to what is demanded through bodyweight training, so in the beginning you're VERY likely to develop tendonitis in the arm if you overtrain (which can come about relatively quickly).