Ali Luke breaks it down in How to Get Your Writing Project Started in Four Easy Steps.
For some writers, starting a project is the easy part. It's finishing that's a problem. Jody Hedlund offers some thoughts about that, in Four Ways to Make Yourself Complete a Book.
Here are some ideas from a previous Friday Five blog post: 5 Timesaving Tips.
Try reading Janice Hardy's What Do You Do When Writing is No Longer Fun.
A big question! Refer to this recent post for some answers: How to Get a Book Published.