Yes, you have to wait for few days.after few days you can see "invoiced"

Regarding affidavit form let me make clear
If the sponsor is using only income - then you would use the I-864EZ
If the sponsor is using assets, they would use the I-864
It means
if you have income more then $24000 then fill form I-864EZ
if you have income less then $24000(not sure $20000-$24000) then fill form I-864
you have to search for sponsor
(Note :- Above income information is only for single sponsorship,if you have to sponsor for
household then income range may change)

Lets, hope it helps to you
Good Luck!!!!!!!!!!!