Install it, and then you need to sign up for an account with Blizzard Entertainment. this is NOT a free account. the monthly fee is about $15.00.
Start your WoW game like normal and Blizzard downloader should automatically start downloading the Latest patch.
No
You can't. If you don't have the current patch downloaded you can't play.
You can not play World of Warcraft for free with out downloading it. WoW is a client-server game, you have to have the client installed in order to play. While there are free private servers available, they are not legal, and are usually pretty buggy.
You can't. if it is still downloading, then you don't have all of it yet.
The only answer for this that i can give you is, "Not really". Considering that you have a computer able to play the game World of Warcraft, I would say patches have little to no effect on you computers speed. Downloading addons for the game can make the game run a small percentage slower each time but wont effect your computer while the game is not running.
Yes it is.
Short answer: NO.
Downloading what?
play wow
You click on the game you want to play and Roblox will guide you to downloading the game.
Installing World of Warcraft (which is the client-side game) and the account (which allows you to play on the server) are two different things. If you have the CD, you can install the program from the CD. Otherwise, if your plan is to start playing again, you will need to log into your battle.net account and reactivate it for play. Then you also have the option of downloading the game from your account, online.