I stained a patio door and I forgot to wipe off the excess stain off. I'm not sure what kind of wood it is but my question is what can I do about it? Do I need to sand it and start all over or can I just put the spar on? It does not look bad, I'm just not sure if it will give me problems later.

If you used an oil based wiping stain, a stain only not a stain and sealer combined, re-wet it with more stain, then wipe it off. The carrier in the stain will reactivate the dried pigments. You can also use mineral spirits (paint thinner) to remove the dried stain.