I would work on what story at a time until you are fully focused and have more experience. It's all too easy to turn your back on what you are writing, especially when it doesn't have your full attention.
As a reader, you usually stop following a writer that starts to ignore one of their books. Update once or twice a week, and find an editor in the writing threads. They are extremely helpful.
A lot of writers will say to update every Friday or whatever. I updated whenever I finished a chapter. I didn't want to lose any readers because they moved on to other books and never got back to mine. Once you've read three books since they've published a chapter, the plot has gone fuzzy your mind and you aren't as interested. I wrote my books in twenty days (each). I didn't want to lose any readers and I didn't want my excitement for my book to lessen.
It take a while to gain readers. I've only just started to in the past three weeks or so, but It's very exciting. I still love my first few readers, but I love sharing my journey with people.
Edit later or edit when you have writers block. Read books in the same category (not just genre) as yours and get an idea of what not to do. If you limit down to categories (best friend, best friends brother, teacher), you'll notice that a lot of them have very similar first chapters and continue on to be very similar books. So read until your eyes hurt and figure out what has been done far too many times. Most readers will search for the category they enjoy reading, so make sure that when they find yours, they want stop reading because they feel like they've just read it. They aren't all the same. You can do incredible things with a heavily used plot, but you can usually count those books on one hand.
