Isn't the (Giant?) Roam XR2 a hardtail mountain bike?
Oliver's pump is a good pump IMHO (I have one too) but you may want the mountain version like this -
link
I personally wouldn't fit a stand (practice propping it up with one pedal on a curb
) as I don't think you need one.
As for guards and lights, what are you looking at doing with the bike? If it's mainly road stuff in town (under streetlights) then a couple of be-seen lights like smart superflash lights might be all you would need, and full mudguards would be good.
If you are looking at bombing down forest tracks then better lighting and crud-catcher style mudguards may be better.