I've never used Gigmasters.com but you're right, it looks like it's geared toward cover bands. Usually these sites are because there's more $ in it.
My experience has been, if you know a few covers and throw them into your original set mix, you can get some gigs around town. Got any friends that gig? One of the first places I've found to get gigs is by teaming up with another local band.
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