first deal! Help!

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Ok guys, being totally new to this and just jumping in I have put a house under contract. I want to know if you think this is a good deal. I found a house a few miles from where I live, nice community. Its vacant, needs 10-15K for repairs ARV estimated at 80K and I put under contract for 30K. I havent got an investor yet ( I know, not good) but needed to get him to sign before its scooped up by another investor. I really think this house could go for 40-50K. My question is do you think I should just try and assign this to an investor for 2 or 3K or be more agressive and try and get 10 or 15K on the deal? Any help would be greatly appreciated, thanks

Brad