Good idea to have a shop check it out but you can't get it bored until you have new pistons in hand. After the shop says it's a salvageable block sit down and decide what you want out of your new motor. Take into account your whole set-up. Trans/rear gear/tire size,etc. Once you start buying parts don't change your mind or you'll be buying alot of extra parts and then trying to sell them later. Decide what you want first and stick with the program. Go easy on the first one because it's kind of an addiction and you can build the second one to suit your ego after you learn everything(yeah right) on the first one.
Just my .02. There's more but I don't have enough ink for it all.