When you first start working out, do not try increasing the weight you are lifting. Instead, work on improving your stamina by doing longer sets or simply more sets. Once working out becomes easier, you can start adding weight or trying harder exercises to keep your routine interesting and challenging.
Hydration is a vital component in muscle building. If you fail to drink enough water, your muscles won't be properly hydrated, which makes injury much more likely. Hydration is not only important for building muscle mass, but maintaining it as well, so don't neglect this important aspect of bodybuilding.
Any time you are lifting a heavy free weight, it is very important that you have a spotter. This is someone who knows the routine that you are doing and also understands when you are requiring help. Many times this person can become a type of gym buddy as well.