I'd like some help earning more SP, but I can't catch on. Can someone please help me with a guide or something for stocks? I'd like to try that...I only have 140k, and I've been here a while.

A good way to start making sP would probably be quests, not stocks. Wizard Quests (located in the Sacred Lands) can make you a nice profit, especially if you end up selling the tokens he gives you. Just don't spend more than around 25k per quest, if there are multiple items. Saggi quests in Centropolis can also make you quite a bit of sP, and here you might not want to spend more than 25k per item. He does however require that you have a minimum of 750k-800k sP.

Besides questing, restocking is also a good idea. Just open a new window in shop search and buy things you can make a profit off of. :) Good luck~