Been a pup in some capacity since the lolpup days before level caps were raised from 75, It used to be so expensive to gear correctly with all the good attachment (back at 75 1mil gil was hard to get and took many week/months to get enough for 1 attachment).
These days not that hard to get gil to get all the great attachments, skill ups are insanely fast also, guard will take lot longer to cap.
At lv99 JSE from weapon+augments from Oboro is very good for how easy it is to get and you can get a i119 attachment very easy for sparks in mean time, until you get the job points up to 100.
But the job isn't for everyone, so before you drop millions just play with it a while get used to manoeuvre and burden system, there is a great pup guide on here/bg wiki might be worth a look.