Hello Renee and Welcome to the Forum:
Whether you have hardwood (oak) or soft wood (pine) makes no difference; either one can be refinished. The one big problem you should look for is face nailing, if nail heads are showing they will tear a sander up and a professional won't touch it.
There are ways to tell which you have. 1. Post pictures of it as close-up as possible 2. Pine flooring is usually wider than hardwood 3. If your planks are 5-1/2" wide, its a pretty sure bet its pine.
Please let us know how it turns out.
Glenn
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