If you need more members ask the owner of the local store if you can put up a flyer with information about the band you're starting. That's usually what people do in my hometown. I think I've seen this subject discussed on here before with more advice than I can give, so you might want to do a quick search and see what turns up.

Once you have all the members you think you need from my personal experience a good way to start playing as a band is to do a few covers until everyone gets comfortable with how everyone else plays. After that is when you start writing original stuff, when the band reaches a certain degree of unity and organization.

We have an entire forum section here for songwriting. For tabs my favorite place is here.