Spanky you should definitely make use of the http://www.minecraftwiki.net/wiki/Minecraft_Wiki, it'll help a lot.
Also, I don't know if the demo has a difficulty setting but if you lower it to the lowest setting (Peaceful) you can actually play the game at night instead of waiting in your house for the sun to rise. Alternatively, and I don't know if the demo is of the version that has this but you can also make a http://www.minecraftwiki.net/wiki/Bed and sleep in it to skip the night.
Yeah, I'm looking at the Wiki. It helps, but it's a whole new experience, so it's just getting used to the mechanics.
I may switch to Peaceful next demo run, but I actually have a house this time (and sheep/cows that have kinda migrated to my front yard....maybe I made farm...).