Hi! I've looked everywhere for these answers but can't find them in the manual or in any kind of guide or walkthrough so I thought I'd ask here

I chose the Warrior way from the first town. With that being said, how the heck do I cast magic? I don't see any way to do it. There's got to be a way to heal myself as I've completely bought every kind of food and healing potion I can buy and/or find. I'm at level 14.
How do I use a bow? I can equip it but not use it. It's correct for my level. It shows on my character and that's it.
I'm on the XBox 360 version of the game. Is there any way to increase the size of the text? It's almost unreadable on my screen. Any help you can give me would be much appreciated!