The website Tony R posted above is where I got all the info I needed for add-ons.
People have unrealistic expectations of Firestick and Roku. They are not going to be able to stream perfectly all the time because the technology inside them is limited by size. Also quite often people's own wifi can be the issue.
I use ADB to side load Kodi etc to the box (but download the repositories directly on to the box/stick.)
It is as simply a case of getting the IP address from the settings.
Edited by Tony R, 08 January 2017 - 08:08 AM.