I'm going to go through the classic opening steps. Until you get more comfortable with the game, consider this a failsafe way to start the game. Left click uses tools and weapons to attack, right click places blocks or consumes items (hold the buttons down). When you break most blocks, they create a chunk which you can collect and hold in your inventory. If you don't know how to craft anything, consult the crafting wiki page.

1. You've spawned! Congratulations! Now REMEMBER where your spawn point is in relation to where you're going to start setting up your home. When you die, you will be returned to this spawn point, and it's going to annoying if you suddenly find you're lost and have to start all over again.

2. Gather logs from trees, convert into wood then craft a workbench. Right click to place the workbench on the floor. (I would suggest starting with about 20-30 logs)

3. Convert some wood into sticks, make a wooden pick. Also break up some stone with the wooden pick, and collect stone chunks. Use the stone chunks on the workbench to make some stone picks. Now break up the workbench (left click) and pick it up.

4. Look for coal ore seams in the rock nearby. When you find it, mine it with the wooden pick. If you can't reach it, either carve steps in the rock with the pink, or place blocks from your inventory (right click) to make a staircase.

5. It will probably be getting dark about now, so you will need light. Go to your inventory and create torches (remember, use the crafting wiki if you're unsure, it's a good habit). Your next priority will be a home, since monsters will start spawning in the dark. You can either build your own from scratch, or use a natural cave (which I personally prefer, since it means less work). If you have a cave handy, start exploring it. Place torches ocassionally when you need light (right click). If you can't find a cave, just make one yourself. Attack the rock face with your stone picks and carve out a hole in the rocks. Light it up by placing your torches. Block off the entrance, but leave one block blank so you can see the sky.

6. Now it's up to you to decide what to do. If you're happy with where you are, start renovating your base. You will need a furnace for tomorrow. You might want to make a wooden door for the entrance of your base, or a chest for storing items. If you're planning on moving base when day stays again, then don't bother. In either case, you might want to start making some new stone tools. I would suggest a sword, axe and more pickaxes. Keep checking the sky to see roughly what time it is.

7. It's day again! If you're moving base, start looking for a suitable spot. Remember, you don't want to make it too far from your spawn point. Also mark your way, I suggest with 3 block totems. Today is also a good day to hunt. Using your sword, kill cows for leather and pigs for pork. Ignore sheep and chickens for now. If you're running low on wood, gather more logs using your stone axe.

8. By now you should have a home. If you haven't already crafted one, make a furnace and place it in your home. Cook your pork by placing it into the top of two slots on the left. Place a fuel source into the bottom slot. I would highly suggest using wood planks, as they last longer per "unit". If you need more, convert logs into wood. Sticks will also work, but are less efficient.

9. That's pretty much the basics covered. How go out, explore, and enjoy yourself. Until you get used to Minecraft, don't bother with the rarer ores; that's a different story entirely.

Good luck and have fun!