Default [Q] Need assistance with Android, moved away from iOS.

Hello everyone,

I have done quite a bit of research over the past few days but I am quite overwhelmed and confused, I thought I will post my questions here as I am now a proud owner of a Sony Xperia Z1 Compact.

I ended up winning a Sony Xperia Z1 Compact from a work competition just the other day, before then I was using my iPhone 4 ever since it came out. I have never owned an Android device, I wish to root it mostly to theme the device. I have tried the Themer application in the Playstore which is fantastic in it's own right, but it doesn't let me create my own. I'm a huge Apple person and I ended up Jailbreaking all my iDevices so I wish to get some of that power out of my Android phone.

1. How harmful is it to root, unlock bootloader etc?.. I would imagine it is no different than Jailbreaking.
2. Am I able to store absolutely everything on the SD card when it comes to applications and tweaks?
3. Is it possible to remap the physical buttons to do other things?
4. I have came across Cyanogen quite a lot, is it stable and will I notice any speed issues compared to stock OS?
5. Is there a "Tweak store" of sorts to download all the extra stuff after rooting the device, similar to "Cydia" for iDevices?

I would really appreciate some assistance, I do apologize once again for being extremely new. It's just a little complicated when you hear there are so many versions of Android and rooting tools for individual devices!