It's a great thing to apply the methods, what you've learned here in SFI and get yourself a quality team, PSA's. Also, by sponsoring affiliates, you learn more and prove yourself as a quality Team Leader.
On the other hand it is also a great thing to consider the S-Builder where you can also get some affiliates or PRM's.
Combining both of the methods can bring you more success of course, what I would personally suggest to you.
