Omega's advise is still the best...but this is a good REFERENCE:
I think you should probably just try to find a better gym... I mean, ****, it's great to grab yourself a good ceiling to floor bag and do work at home too, but if your gym isn't worth the time being there, just go somewhere else ya dig?
The problem with learning from a video, website or book is that you will not be getting feedback. You will invariably pick up bad habits that will take more time to unlearn than they took to pick up.