Soul Gems are what you need. There are 5 levels of gems, so buy the approrpriate ones for your character. Some mobs drop them, but I don't remember getting too many of them at early levels. You buy them from a Mystic in town, usually they are near the Enchanter, but not always.
Do not buy them filled, the game gives you the Soul Trap spell for free. Add the spell to your skill bar, then go hunt mudcrabs near your level. Do some damage, cast the soul trap spell before they die, and you have a filled gem.
Note, once you get the skill built up enough, there is a passive that gives a 10% chance to fill a gem without casting the spell. I don't even put points back into Soul Trap anymore, just the passive.
As for your Quickslots, open up your inventory, then right click on an item and choose Add to Quickslot. Then in game, use the Q key to bring up the wheel and select what you want to use, then when you want to use it, hit the Q key. Changing the item you use with the Q key can be kind of tricky in a battle, but you will get the hang of it eventually.
Edited by Nestor on December 23, 2014 4:20PM
Enjoy the game, life is what you really want to be worried about.
REZ gems are filled Soul Gems, they can be used to resurrect a fallen ally (or yourself instead of going to the nearest wayshrine).
You can buy filled soul gems from Mystics (vendors) or you can buy empty ones and fill them with the spell in the world section of your abilities. Personall I recomend investing in the passive that gives you a 5% chance of filling a sould gem i you kill an enemy with your weapon.
Now putting potion in your hot bar is done from your inventory, in the top left of the box is a icon that says "Quickslots" when you hover the pointer over it. this allows you to put potions in the Q menu, which activates a potion (when selected) when you press Q, to select the potion hold down Q to open the Quickwheel and select the potions you want Q to use.
And yes the Quickwheel is very slow to manually use in combat, so preselect before a fight.
People believe what they either want to be true or what they are afraid is true! Wizard's first rule
Passion rules reason Wizard's third rule
Mind what people Do, not what they say, for actions betray a lie. Wizard's fifth rule
Willfully turning aside from the truth is treason to one's self Wizard's tenth rule