Use a decent mouse that you find comfortable to use. Doesn't have to be too expensive.

Use the 2D Mode. When you hit a shot you'll see the roll of the cueball and angles well. This will improve your knowledge of angles and getting the right position.

When you hit the Cue Ball just above the centre, it makes the Cue Ball roll better and it will increase the chance to make the pot.

When your going to play a safety shot, try to leave the Cue Ball tight on the cushion.

Find a Break Off Shot that increases the chance of you winning the game. A good break has to split the balls well, and at least one ball has to go in a pocket. When you find a break like this, it will increase your chances of winning the game with a 'Run-Out'.