My advice is that it's almost always faster/more efficient to focus on leveling, and just get whatever gear/bags/plat you happen to earn while XPing, instead of spending time at low levels focusing on plat. If you get 10 levels you will earn plat noticeably faster, but if you instead get even +50 Int in gear in that same time, I truly don't think you'll level noticeably faster.
That is
especially true for casters, because they could basically wear their starting robes until 30 (40+?) as long as they buy their (relevant) new spells. If you focus on XP and sell whatever you pick up along the way, you should have enough for both spells and bags.
But that being said, it's a game: do what's fun
[You must be logged in to view images. Log in or Register.] Also, at around level 13 (maybe even 12 as a necro?) you can kill the guy who drops
https://wiki.project1999.com/Shralok_Pack (during the daytime) in nearby Kithicor for both XP and a great bag.