I am not familiar with the 4081 cartomizers, but on the 510 Boge's that I have, I pop off the rubber mouthpiece end, drip about 20 drops of juice down the sides while rotating, letting each drop absorb, put the cap and condoms back on, let it soak in for a few hours, then blow any excess juice out before putting it on the battery, then vape away! Depending on the cartomizer, they can be filled 2-10 times before they start to die, so you will need to find some more somewhere if that is what you want to use mainly. I didn't see any available on the site that you listed, but I have seen them around.
For the carts that came with my 4081 kit, I removed the batting with tweezers, put about 5-10 drops of liquid into the reservoir, replaced the batting, put a couple more drops on top, vape away! The atomizers and carts on these don't hold much so I found it more convenient just to dip. I put my juice in a clean contact lens case and dipped the bridge of the atty every 5-10 puffs. I pulled all of the stuffing out of my carts and tried the PTB mod, it didn't go so well, but if you plan on giving the carts a go, you might want to look into a blue foam mod, stuff they use in aquarium filters that can be purchased from a pet store, I think it is called Fluval but that might be something else. Lots of info on the forum somewhere about it so a quick search will lead you in the right direction.
I am glad you are getting all set up, but if (or should I say when? lol) you feel the need to upgrade at some point, go for a 510 or 808 battery connection, like an ego, 510, bloog, etc as those are the most popular kinds and most places in Canada will stock atomizers/cartomizers/spare parts so you don't have to worry about customs and long waiting periods, shipping costs, availability and prices for the things you need.
