There's some good banjo setup sites, these and others from Deering, Nechville,, Warren Yates on youtube:

You want to do adjusts:
- tension the head evenly, if you can borrow a drum dial from a banjo or drummist, that helps a lot
- connect the lag bolts or dowel stick so neck and pot are securely joined, don't overtighten nuts on lag bolts tho
- correct height bridge and tailpiece

If you have questions you can PM me, or ask on that, y'know, banjo forum and you'll get *lots* of advice