all depends on what you want to do, do you enjoy FW flying or not. I have never touched a FW because they never interested me. FW pilots are better to teach as they have a basic understanding of radio,circuits,etc.
As for solo, depending on the student they may be ready at 15-20 hrs. our company insurance states 20hrs.I wont let them go solo untill they can maintain a good cicuit and understand all airport procedures and can complete an auto, and take off and land without getting dynamic rollover.
A FW licence is also good later on as it is a much cheaper way to do your instrument. and cheaper to take mates away on weekends.
Good luck with your flying
Helijo