Assuming you have Stardock Central installed, you can deselect the "Show pre-release versions" versions option at bottom of window.
This will result in Stardock Central only showing the official "released" versions of all programs.
I would suggest this route to begin with, so you can enjoy the programs for a while before venturing into the "beta" world - which will have bugs (these versions are for those people who want to help with the development of the programs, and do not mind when things go sideways - which requires troubleshooting).
As badblueboy indicated, it does not matter which program you install first.
I would suggest installing WindowBlinds, Icon Packager, DesktopX, and perhaps ObjectDock (which is not actually part of the Object Desktop suite, but is a free download listed in either the "Misc" or the "Free Stuff" categories.
If you need some further explanation on installing, you can see my mini tutorial here http://corkyo.wincustomize.com/Articles.aspx?SID=5463&AID=83625
Have fun.