what sorta frame?

check the rear spacing? 130mm? 120mm?
brakes - your choice, front is all you really need but you can go for both to be fully roadworthy.
gearing? depends on how you like hills and sore knees. In terms of gear inches anywhere around 70 would be OK to start at.
make the chainline as straight as possible.
not much else to know except go for it.