1. Download steam, Origin, Impulsedriven
2. Make accounts on there
3. Yes
4. Depends on the game
5. Don't get a Laptop, get a PC.
6. Steam is where you buy games.

FruiTTs wrote 1. How do you play online with pc?

Depends on the game. Some games make you use their game launcher while some just let you use things like Steam or Origin.

FruiTTs wrote 2. Do you have to make some sort of account for online?

Same as above, it depends on the game. Most big title games just use Steam or Origin which allows you to use the same account for all the games you have on there.

FruiTTs wrote 3. Does it cost for online?

Again, depends on the game. World of Warcraft for example has a $15 monthly fee to play while games like Call of Duty or Battlefield only require you to buy the game. There's a very little amount of games that charge monthly fees (it's usually MMORPGs) so don't really worry.

FruiTTs wrote 4. Is keyboard and mouse better than controllers?

Yes. There's tests that show that keyboard and mouse is significantly more accurate than a controller when playing games such as FPSs. There's also a lot more buttons that can be used therefore more can be done with it.

FruiTTs wrote 5. What laptop would be the best I mainly play CoD, Battlefield, Skyrim and games of that sort.?

The kind that isn't a laptop. Seriously, don't bother with a "gaming" laptop.

FruiTTs wrote 6. What is steam?

Online store where you buy games.