release free or for money?

[eluser]Gewa[/eluser]
Hi there,
just loosed some 1.5 year to make a social networking script on codeigniter very similar to phpFox , classmates.com or facebook.
Now I want to make some social networks for me and also profit from the code. WHat you will advise? To release the 1st versions free then to make it for money or?
Has anybody experience on selling Scripts?
Any advice discussion would be fine!
Tell me profis what to do