Firstly the text commands (case sensitive mind you) are /equip [slot] "Item Name"

So say you wanted to equip a justice badge, it would look like...

/equip neck "Justice Badge"

Note that the slot spot is whatever the name is on the equip menu, which is under the main menu when you hit the - key on the numpad.

Btw /commands are best used for macros, which I suggest you look into. Thier on the second half of the main menu (hit either left or right on the arrow keys to move over to them) and find macros and just select a brand new fresh and blank set of them and just make some.

As for magic it's just /ma "Spell Name"

Again all those commands are case sensitive. And much be spelled exactly as they are in the menu.

As for your second question you can begin missions from the gate guards of each town. Thier the ones next to the signet givers. You just talk to them and they will give your any mission you are able to meet the pre-reqs for.