Pre-exhausting muscles is a great way to build the most stubborn groups. For example, your biceps might be fatigued before your lats on rows. When you complete isolation exercises you help fix this, do things like straight-arm pull downs which don't necessarily concentrate on your biceps to complete. Exhausting your lats before doing rows will even out your muscle use and allow you to use your biceps to exhaustion.
If you are new at working out to build muscle, focus on your form rather than your strength. In time, you will be able to increase the amount of weight that you are lifting. However, if you hold form that is even slightly off, it will become worse as time goes on. This can mean that all of your hard work and effort are lost over time. This just means you are powering up your looming injuries, which are the opposite result you want to achieve.