Saying you want more definition is specific. Saying you want to reduce body fat from 20% to 10% is specific. Etc, etc.

Once you have clearly defined goals, you can create a plan to help you achieve those goals. There are 3 major components in weight training:

Diet.
Sleep.
Training.

And I feel they fall in that order too.

Diet is the most important because regardless of your goals it is usually your diet that will make or break them.

Sleep is important for recovery. You'd be surprised what an extra hour of sleep can do for you.

Training is definitely important, but it doesn't have to be complicated. Incorporate a solid weight training program with some cardio (only if you need the cardio) and away you go. Stick with compound movements (squats, deads, chins, dips, etc.) with the intent to build muscle. The more muscle your body has the easier it is for you to burn fat. I doubt you'll become 220 unless you put an honest effort in becoming 220, so don't worry about that.

And don't be scared to experiment with rep ranges, sets, etc. Everyone responds a little differently than someone else.