Hi ktel, you don't need to replace any parts right at this moment.
First your battery should be charged every 2-4 days and it's all depends on how often you cape. You may charged it daily but you can two to switch around. You do not need any more parts since these tanks all fits onto the eGo-C and you just screw them on.
The stuffs that is in the bundle does not need those small atomizers. These are clearomizers and you can just fire them up. You just have to know how to put the juice into these tanks instead of through the tube. Some we call top feed and some we call bottom feed. I found the T2 and the MT3 to be the easiest and may be you should use them first.
There will be a bit of trial and error, and you may get some burn taste at the beginning, but it will be very minimal. You have 6 bottles of juices, so you can at least try 6 different flavours. None of these tanks are glass or acrylic, so on certain juices the tank will crack. Try to avoid caramel stuffs. I have not experienced any cracked T3 or MT3 myself.
Once you tried 6 different flavours (make sure you rinse your wick and bottle thoroughly if you are thinking of using the same clearomizer), then you can order other flavours if you want. As you should know, you have to log into your account first before you can see e-juices with NIC. Unless the shipping cost is outrageous, you may want to get more juices to try. And there are many different vendors in Canada selling juices too. However for the hardware that you want at this moment, CanVape should be a very good place to start.
I shop there myself too and I am very pleased. Oh BTW, order before Thursday afternoon and you can pick it up at one of their flea market location on this weekend. You don't need to do interac as you can pay them directly during pickup.