Welcome to Construct 2!
I recommend that for your first game, spend a month or two on it, get it minimally working, post it here, and someone will take a look at it. The whole point of your first game is to practice your game making skills. If you can't get it working after about 4 - 6 weeks, don't worry about it - just start your second game!
For your second game, take what you learned on your first game, give yourself about 8 weeks, and see what you can accomplish. And definitely post it here.
Lastly, don't be afraid to look at the forums and ask questions. There are many experienced C2 users here who can probably figure what is going wrong with your project pretty quickly.
Good luck, and welcome aboard!