Hi Ana. When starting out in SFI, it is good to invest both in advertising and in a EA qualifying purschase but, first of all I believe qualifying as a EA is very important because this is the first step in bulding a successful business with SFI. Learn, apply, qualify for EA, advertise, sponser and build your Team to do the same.
Do everything at the same time if possible but, do first what you can do best!