Just ignore him - he likes to spam the forums telling people to get sasuke rinnegan and do great plates without any good context.

As for your question, you are bound to get free protection vials and breakthrough vials without even trying but the amounts are low. Since it not guarantee to get a certain skill, try to get a lot items. I usually try for 150+ protection vials and 200+ breakthrough. As a f2p, personally I wouldn't spend my coupons as I could use my coupons elsewhere as I'm earning these items for free. If you are paying, go for it.