Goth,
You've done the hard part. Now shove it in a corner for a couple weeks. Then read it, fixing plot holes, character inconsistencies, et cetera. You won't find them all on the first pass. If you haven't done it already, create an outline, with particular attention to timing of events. That's the raw material for your synopsis.
Maybe you find something that takes you in a new direction. That might take a couple more drafts to get right. Now into polishing, looking for natural chapter breaks, getting the tenses right in flashbacks....
Final spelling and grammar check comes next. Then you're ready for Microsoft Anna or some other program or even a real person read it to you. The whole thing. That counts as a draft too, because you're be cleaning up dialog, redundancies, and sentence structure as you go.
Then write the synopsis. You'll need long and short ones. Then, finally, the dreaded QUERY letter.
Then sit back, take a deep breath, close your eyes and post your first chapter in Share Your Work.
Repeat as necessary.
