Age old story, don't start too ambitious if you've not got much experience at all. It may look and sound like a walk in the park now but making a complete game is a massive undertaking that will take work, hours of it, so don't waste your time on something that'll give you a learning curve steeper than a vertical cliff.

But if you want to get a project itself of to a positive start I would suggest...

1) Get your player model in a fit state, your game wont feel like your game without your main character at least patched together.
2) Create a basic testing level and then go to work on creating your fully functional player entity. If your a lone wolf then your going to struggle to make any sort of useful level when your workflow relies on you alone.
3) Once you've got a semi-working model for a semi-working player script then give making a full level a go. If you want everything in the game to be yours by the end, make everything yours from the start. Avoid free textures and models in other words and make your own.

Then just work your ass of and hopefully you'll have something to be proud of by the end.