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[Scatty]

When you move the mouse towards the four edges of the screen, there will be direction arrows pointing at that direction. When you click right mouse button while it's in the position of these direction arrows, and hold it, you begin to walk, or run there as long as the mouse button is held. The further your mouse is to the edge of the screen, the faster you move.
Also the fire will burn you. Not much damage, but it adds up. You don't need to walk into fire to get something out of there (things won't burn in fire, btw.), just walk slowly a bit closer to it. Then you can left-click on things on fire, hold the mouse button and drag the thing to a different position. If you drag it too far away from your figure, it will be thrown there.

To get access to your inventory, either double-click with left mouse button on your figure, then on the backpack on your figure in the stats window that opens, or just press the I button (or was it B?).
One thing to add about the backpack - learn to micromanage it. It is very small and you'll find many things, and all won't fit into the backpack in such manner that you could see them all separately there. So you'll discover that you'll need most of the time to place things in backpack in such a way that you can see the edges, or corners of these things under another things. All you need is just to click on the edge or corner of a thing under another thing, click and drag it to another spot (in or out of backpack), or simply double-click on it to use it (if usable, but most things in Ultima VIII are).