I am writing not because I have alot to offer but I would like you to feel better. You are not alone in this task and it can be difficult. I am going through the same thing.

Just take it one step at a time. If you got the engine turning that is a great first step. Now just take it one step at a time. Make sure oil is flowing. Make sure fuel is pumping. Make sure you have spark. If at any point something is not right track it back and fix what is missing. Then move on to the next. Don't try to rush the process. If it seems like everything is right send a shot of ether down the carb and crank it over. See what it does. Adjust, tune, rinse, repeat.

Eric