1) Should I stretch it EVERYDAY, how often should i stretch it?
When its a little sore or in pain, should i avoid stretches and let it sit?
Stretching randomly is a haphazard approach that doesn't necessarily have cross-over to the exact movement that you will be involved in. I don't quite understand what has happened, or what has 'pulled', and what incident caused it. But I do not believe merely stretching it will solve the problem.

2) When can I start lifting to make it stronger? (I remember the rehab i had two years ago for the same injury , that he started having me lift and make it stronger when i still had a little pain and I second guesses his decision but in the end he was right and i became healthy) So when should I start lifting to make it stronger?
Strengthening is strongly correlated to lesser incidences of injury, but also improved recovery from injury. However, one can easily strengthen a muscle group and exacerbate a condition. For example, a shortened muscle can be made to become shorter and tighter. A common example being bench pressing: Person bench presses, gets protracted shoulders, bench presses some more and exacerbates the condition.

3) When can i start doing some rehad running?
Some form of modified activity is probably best suited. Or some form of pre-rehabilitation that allows one to manage their pain/issues before activity.