Welcome to the club! Mekonbekon summarizes it pretty nicely. I personally, would advice you to do this:
Start small. I mean REALLY small. Try to hit the export button as often as possible. A good way to do this is to have one small project every few days/once a week. Then you can upload them to the Scirra Arcade and get some feedback. If you need ideas for what to do, you can check out the theme list for Ludum Dare. This is a game jam that gives you 48/72 hours to make a game from scratch and release it. For example, you can make a mock version, where you are the only participant (the contest isn't running at the moment).
http://ludumdare.com/compo/ludumdare/
Another tip is to fail faster, this video from Extra Credits explains it:
Finally, you should take regular breaks. Eat well and have a good sleepcycle. If you don't have any energy after day 4, then you're most likely not doing it correctly.
Happy gamemaking, and good luck! <img src="{SMILIES_PATH}/icon_e_smile.gif" alt=":)" title="Smile">
Also, the forum is always here to help. So feel free to ask questions.