Join a writing group such as Romance Writers of America. They have chapters all over and there are tons of online writing groups to join. The more experienced writers are usually happy to share their knowledge.
Most of all: write, write, read and write some more. Set goals for yourself to write at least one page a day. Just think, at the end of a year you’ll have a full length novel! Even if you think it’s crap, keep writing. Nora Roberts has said that she can work with a page of bad prose, but she can’t do anything with a blank page — and she’s right. Good luck!