I'm not familiar with gDiapers, but if they are like most cloth diapers, the recommendation is to wash and dry them a few times before you use to to remove any residue from the manufacturing or shipping process, I believe.
I use prefolds, AIOs, fitteds & pockets, and for washing dirty diapers I wash them on cold with soap (Charlies Soap, recommended for diapers, sensitive skin; no additives, brightens, fragrance, etc.), then wash them on hot, then give them one extra rinse.
If they get stinky (or are particularly gross from poops...), I soak them over night with a couple of tablespoons of baking soda in the water, then run it through a cold wash cycle (no detergent, just the soda). Then I wash in hot water with detergent, with 1/4 cup vinegar in a Downy ball, and an extra rinse. Again, as I said, I'm not too familiar with gDiapers, so maybe you don't need this extra washing/rinsing....
For a diaper pail, you don't need an official diaper pail--use what works, because we only wash every 3 days, I bought a regular garbage can with a step to open the lid (hands free! LOL!). IMO, a garbage can with a lid will help keep the smell more "contained".
In terms of a wet bag, you can use a regular garbage bag until you get the wet bag. What I did was, using a trash bag that fit the garbage can we use a diaper pail, I just sewed a "fleece" can liner (basically, something that looks like a big open-ended pillow case) and just throw it into the wash with the diapers. If you go this route, you might want to sew two -- a clean one for when the other is in the wash.
Good luck with you're gDiapers.