As a fellow aspiring novelist, I can offer a few points of advice. The over idea you should remember, though, is that you should ALWAYS BE WRITING. If you aren't writing regularly, don't expect your career plans to move forward.
Other things to follow?
1. The best way to get your ideas out is to just start writing and see what you get. Pick a point in the story and start writing it. Many writers (like myself) are discovery writers, meaning they find they're story as they write it.
2. Don't worry about what you write being terrible. First, this can stifle your creativity, as you worry more about quality than actually generating content. Second, most of what you write in your first draft will be bad anyways. Drafting is half the work of novel writing.
3. Let someone read what you're writing. This will help give you a sense of responsibility to keep the story going, and will allow you to get some feedback on your prose.