New to Android (Questions)

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http://forums.androidcentral.com – Got quite a bit of questions, don't know anything about Android 1. After you root your device does it reset everything you have or do you keep everything? 2. Can you install more than one ROM or you can only install one? If you can only install one, how do you combine ROMs so you can use the other one in conjunction? 3. Good root apps I should have 4. Any way to remove the stock apps when rooted (I'm trying to get rid of phone and messaging because i'm using it as a mobile player rather than a phone and would that affect anything?) (HowTos)