@Danorak1981 First off don't use NOOBS. If you are going to install KODI on a separate card you should use a lightweight JEOS (Just enough operating system) for it. The most popular / supported are OSMC and Librelec.
Maybe go with Librelec as OSMC has a lot of customisations peculiar to itself.
I've not used a wireless controller with KODI, so can't advise but I would always advise people to have a USB keyboard for the PI as it always comes in handy.
The best smartphone app for controlling KODI is the official KORE app, another is YATSE but it is a bit bloated these days. Also bear in mind I stopped using a phone app for KODI as it eats battery life like crazy as it works over the wireless network and is constantly broadcasting a WiFi signal. You should get a mini keyboard like the Rii i8+, I have one for each of my KODI Pis.