Current Fees for Permesso di Soggiorno: 16 Euro Marco di Bollo Stamp (avail from most Tabacchiera. 30 Euro for the postage fees. 70.46 Euro for a one year and 80.46 Euro for a two year. You want the two year, but some areas are only giving one year ones. Currently the processing time is at least four months and up to eight or nine.
A link to a blog writer in Rome. He’s been through it all, and the resources are quite good. You will need to subscribe to the newsletter to get the download link to the guide, but its worth it. This really is the best step by step guide to filling out the forms. I have also included a couple links to resources that show you filled out forms that some schools put up to assist students. Most of it applies.