Noob Building First RetroPie/Kodi Box

Gwathnar

I'm a noob to Raspberry Pi and Retropie.

My better half bought one of those Android boxes for one of our TVs and I thought it was pretty neat. I thought it would be ever cooler with some games on it - this is how I stumbled on Retropie.

I bought a Rpi 3 1.2GHz with 1Gb of RAM (http://www.canadarobotix.com/raspberry-pi-board/2012)

I've also purchased a case.

My first question is how do I set up to have both Retropie and Kodi on the 1 device. I'm assuming a dual boot set up.
Second, I plan to use my Xbox 360 controllers since I've already got them. Will this work for all games or should I purchase some SNES style ones? I'd like to go wireless if possible. If I should have SNES ones on hand - do I need a Controlblock or not?
Lastly, storage - I was thinking of getting another usb external HDD to store all my roms/etc, are there any limitations to what I can use?

Thanks!
I cannot wait for my Pi to get here.

synack

Keep a link to the wiki handy top of this page), it'll have most of the answers to your (future) questions.
https://github.com/retropie/retropie-setup/wiki

Kodi is available from the optional packages within the RetroPie distribution. No need to dual boot.
https://github.com/retropie/retropie-setup/wiki/KODI

Xbox360 Controller guide
https://github.com/retropie/retropie-setup/wiki/Setting-up-the-XBox360-controller

There are not explicit limits for external storage, and setup would be similar to an external USB stick.
https://github.com/RetroPie/RetroPie-Setup/wiki/Running-ROMs-from-a-USB-drive

This guide is specifically for external HDDs
http://www.htpcguides.com/properly-mount-usb-storage-raspberry-pi/

I'd recommend not going all out with an external HDD yet unless you're sure you need it.

gromgsxr

you can pick up 32 or even 64gb sd cards pretty cheep so depending on what games you want to keep either of those will give you plenty of space, megadrive and snes roms for instance are a few mb in size. i recently set up retro pie with kodi and 125 games using nes,snes,megadrive,psp,n64 and ps1 and it was about 16gb in total

Gwathnar

Thanks!