As you know the importance of weight training and whether you want to do it at home or gym, you need some preparations.
No panic required, follow these steps and you will be fine.
First of all, if you are a newbie or never done any weight training before or suffering of an illness, you have to consult your doctor or do medical check up.
If you are hiring a personal trainer, tell all details about you, it will make his job easier and find suitable exercise for you.
Done with the medical check up, next thing you need to do is find the right shoes. They don't need to be expensive ones. Basically you'd need good solid platform shoes. Running shoes or cross training shoes should be fine.
You will also need proper clothing to move freely.
Dont forget to warm up before you lift weight, by doing this it helps your blood flowing and loose joints. This will only take 10-15 minutes before you start lifting weights.
You are all warmed up and ready to do some serious work. To avoid injury, pay attention with your posture. Your shoes should be facing to the front, chest up and lock your core.
Breathing plays important role to enhance your lifting and give oxygen to your body. Exhale when you lift up your weight and inhale when your weight down.