I agree with nice indica or a hybrid with growth traits that lean on the indica side. Your going to want something that is easy to clone!!! any autoflowering strain I would stay away from. It wont hurt to run a pack or two while your getting your set up operational, to test your green thumb.
You only have the option to run hydro not soil in a collisium. So get your info from experience hydro growers. I use organic soil but anything I tell you about nutrients you will need to take with a grain of salt, since the media we use is on opposite ends of the spectrum.
If this is your first grow. Keep things simple. A 550 site is a big op to run. You got to veg multiple mothers huge to get all the clones you need. Secondly if your new your survival rate of clones will be less.