The best players of games like this usually just stick with one character or in this case one race. Develop better skills by keeping it simple and sticking with one race whether it is the Protoss or Zerg. I know it is tough to pick just one race but the creators made sure that each one is equal and has the same chance to dominate as each other.
Learn how to use them as effectively as possible through reading guides and practicing. They are yours for the taking. Get in the game with your race and be sure to dominate all the other players out there. So you need to focus on improving your skills fast.
Use a Starcraft 2 guide to really get good at this game. Becoming a pro at using their skills and abilites is very important in this situation. Note the advantages each one has for example with ghosts you can lock down mechanical units with a skill they had in the first one. First off actually knowing what each unit is there fore will improve your perception on each game.
