You have a house vault in your Inn room. When inside your room, right click the door and bring up the house vault.
It's only 2 slots, but you can put backpacks or boxes in there full of goodies. Set your price and the goods will stay on the market for 24 hours. After that you must log back in to bring them back into the market.
At level 6 there is not much you can make for a steady profit. There are some spells and skills that you could make and sell, but for the time involved it's not really worth it.
If you want to make money and be an Artisan, you need to get your level up so you can make better items. Remember, you can only make low level stuff that only low level (and poor) folks will want.
So not a big market there.
Backpacks and boxes sell fast, you could try those at a low level.
As for secrets of making money...look around at various tradeskill forums to see what people are doing. But don't expect someone to give away their money making secret. :)