Basically the addon environment is in flux with repo's changing and those who have not shut down voluntarily will have the law down their necks pretty soon. So basically unless your technically proficient and willing to mess with the software on a regular basis these boxes sold with films and tv pre-configured are likely A, already broken or B, will need your intervention C, no more gvideo so no more good HD buffer free services on public platforms.
@Pleatfooted is a good example of a diligent chap who stays on top of all the addons, you will need his level of diligence to keep good sources available. However if your last box had a load of HD live sport links free you won't get them this time, the kodi good times have ended to put it in a nutshell.
The point of you noting not being technical sets you up for a big fall here, could you link me the box your after, send it in pm if you feel more comfortable with that and i can tell you better what your getting.