Finishing Drywall in Garage

I'm a newbie with drywall techniques and I just bought a new home that has an unfinished garage. The walls are taped, but I'm not sure if there is a layer of mud over the tape. In some places it appears like there is, in others it doesn't. In any case, what steps do I need to take to finish it? Do I sand it smooth like it is before I apply more joint compound? Is it likely that there is a layer of compound over the tape? If so, do I only need to add one coat of compound or two?
Also, if anyone is very good at this and can give me any pointers I would highly appreciate it. I want to avoid the common mistakes that rookies typically make. Also, if you know any tricks that would be great too. Thank you.
Matt
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It should be taped with two layers of mud, one under one on. However in a garage they generally don't bother with any nice finish.
You can scrap down the existing high spots with a drywall knife and add another coat. Continue using wider knives and the same procedure until it gets to the quality you want. Then sand lightly. It might be good practice for any other work you may want to do later.
The usual error new people make is using too much "mud" and trying to use a three inch knife to do the whole job.
Drywall is forgiving, in that you can keep working at it until you figure it out.
--
Joseph E. Meehan

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