I'm either really stupid and/or blind but I'm really struggling working out some of the finer points of the chaos marine list... few questions for you all

- "
One chaos space marine lord character and eight chaos space marines"
is the chaos lord's stand considered an addition to the 8 already mentioned, or does he form part OF the eight stands? presuming the latter but I'm unsure
- as per above, adding a champion to the retinue (and an icon bearer now that I think about it)
are these added as additional characters? i.e. they get a stand to themselves, or can they be grouped onto one base if desired? i.e. I've bought a black legion retinue, I've upgraded the lord to a warlord, I've also bought a champion and an icon bearer... can I decide to place the icon bearer on the warlord's stand and leave the champion on a seperate stand?
- for this part of the black legion army list specifically, "
For every Retinue taken you may select one Elite formation and two Support formations. Each formation may take a maximum of 4 upgrades, but each upgrade can only be selected once by each formation.does this refer to each formation in that pack of 1 retinue, 1 elite, 2 support? or does it refer to the whole army at large?
i.e. I have two black legion retinues, are they limited to taking upgrades the other retinue hasn't already got? or is it only within the support formations and elite formations that are related to that retinue?
colour me confused (and stupid)