1at time buyer for a home!! need advice?

i am going to see a house tonight after work. it is for sale by the owne. It sounds like a really good deal! Its a house on 3 1/4 acres of land and they are half way done with an additin which is going to be built into another 2 bedroom 1 bath addition! Of coure i will have to finish the addition myself! but the house i only 225,000! do you think thats a good deal? Also please feel free to leave me any additonal advice! Thank you!