There are a couple of good instructions/videos on covering here. Take your time when covering and do not expect the first covering job or two to look that good.

The 2 primarily used coverings are Monokote and Ultracote. Each has certain advantages and disadvantages and "followers".

Each type of covering requires a different "knack" to get it right - the majority of the skills needed are very easily transferred to other types of coverings, so don't be afraid to try different coverings.

For someone just starting to learn how to cover, I suggest Ultracote initially. I (and others ) have found that it goes on around wingtips substantially easier than Monokote, requires less heat and doesn't gas out (for bubbles when used over a solid surface ) anywhere near as much as Monokote.