I had the same trouble til about lvl 18/19 when you do get a storage option... but I wont tell you how as I dont want to ruin the story/game/suprise for you.
The best advice I can give you is to ensure you find the alchemist to brew your herbs ibti potions, the enchanter to use the gems/ore and you can insert any charms into items (I didnt discover this til recently)
Other than that I did find I ended up selling weapons and gear I possibly could have used in favour of what seemed the best choice at that time.
I hope that helps a little, but I'm sure the good guys and girls on here will have some other and possibly better solutions.
