Dear Fransisco
Ajay Sir has given you a exhaustive list of Tcodes which will suffice for you.Depending upon your requirements you should use them. One important aspect is that you need to do above steps strictly in the same sequence in order to get the correct figures.
Further to add, you should ensure that standard cost is available in material master so that variance analysis can be done in real sense.
Regards
Rajneesh Saxena