Hi Maha, sounds like very big ambitions. Be sure to read about pro and cons of Problem Based Learning and collaborative learning.
I’m now reading an article on the Tyranny of networked learning.
According to the writers you need good coaching of the self led peer group. Plus you need to set some kind of rule to help the students to start. Too much freedom can have a paralyzing effect.

E.g. When you have to write a poem for the first time, just saying anything goes can paralyze the students. But if you set simple rules like use a rhym scheme of ABABA and write 5 rules, those simple rules can help them a lot.