In which order to add stuff

A few years ago I bought FSX Gold, installed it and found no time to use it. Meanwhile I acquired quite a bit of add-ons which I have not installed yet. Now I just retired and will have time to start. My question is in which order should I install the following:
Freemesh X
REX
Orbex Global
Orbex Vector
Orbex weather themes
a few orbex airports as well as freeware from Simviation
a few sceneries and photo sceneries from Simviation
Orbex Pacific Northwest
FS water configurator
Ultimate terrain X
Maybe there would be a few items above which would be in conflict with each other.
I would appreciate your suggestions.
Freemesh X
REX
Orbex Global
Orbex Vector
Orbex weather themes
a few orbex airports as well as freeware from Simviation
a few sceneries and photo sceneries from Simviation
Orbex Pacific Northwest
FS water configurator
Ultimate terrain X
Maybe there would be a few items above which would be in conflict with each other.
I would appreciate your suggestions.