Welcome to OCDO. IIRC we have already gone over the join VCDL, come to breakfast/dinner stuff, so will not repeat it here.
Plastic (or plastic coated) cleaning rods will be less harsh on your barrel. You need a rod that is a couple of inches longer than the barrel so you can get swabs/patches all the way through. Aluminum is probably harsher than steel - go figure!
Do you want to go with "lintless" cotton patches or flannel which admits it has lint? (Stay away from synthetics - they just don't seem to work and some will actually melt if you use them with the wrong CLP - see below for explanation of CLP). Do you want to use plastic or brass for your jag and patch holder? Or do you want to just go with a jag or with just a patch holder? Decisions, decisions, decisions.
Simple Green is pretty much death to Glocks and anything else that has aluminum, so stay away from it. You can put your Glock in the top rack of the dishwasher, but unless you are a bachelor you might not want to let anybody of the wife/girlfriend persuasion know you did.
The acronym CLP (cleaner/lubricant/protectant) is also the brand name of one variety of that stuff. It's billed as an "all-in-one" product. How it knows which function you want it to do is a mystery. There are products specifically to dissolve copper, to neutralize nitrates/phosphates/ring around the collar. Some folks swear by one brand at at all the others. You will have to decide if you want to go the specific-function or all-in-one route.
Stay away from WD-40 - it will leave a varnish-like scum behind. 3-in-1 oil is too fine and will not provide lubrication that lasts. Be careful if you go with Ballistol - you might find youself using it for all of the other things they say it can do/is good for (mostly spot on).
You can go to Wal-Mart and buy one of the basic cleaning kits and be good to go, although you ought to stock up on patches which you will go through quickly. Do you insist on a new, clean patch every time the cleaning rod goes down the barrel, or will you be in the camp that says that if you swish them around in the cleaner all the dirt is rinsed off so you can use it again? (Those are generally the folks that tell you to let your cleaner sit for a few minutes so that all the suspended crud settles to the bottom, and then not to dip the patch all the way to the bottom where the crud is.)
One more thing - unless you live alone you might want to rethink any ideas of cleaning you gun on the dining room table, in the kitchen sink, anywhere inside the house because the fumes stink up the whole place. There are folks here who could tell you stories about stuff like that.
Now, sit back and wait for everybody to tell you why everything I wrote is wrong and what you really need to know/need to buy/need to do.
stay safe.
