Just follow your dentist's post op instructions (to help heal) and thats it.
so what is the next thing to do ? i dont need to do anything after the tooth extract?
If its to the point that a dentist says the only option is to extract the tooth, thats usually the only good option. When it comes to this, the only option to save it includes bone recountouring, rootcanal, post/core, and a crown...which would come out to more money than an implant with a smaller chance of success.
If you cannot afford an implant, best thing is just have the tooth removed and be done there. People can easily adjust to losing a second molar and function just fine (80% of your chewing is first molar and forward). At your age I would not expect huge amounts of bone loss in the next 4-5 years, so if finances better fit you down the road... an implant would not be out of the picture at a later time. I have had many patients finish treatment with just first molars and been quite happy.