You're welcome. Welcome to Vaping Underground. A lot of info to be found here.
As to the new mod, I was looking at the Cuboid but ended up getting the rx200, I like the way it fits my hand better than the Cuboid is all. Runs the same circuit board as the Cuboid, is 200w and is upgradeable also. Any tank can fit any mode, but coils are dependent on the tank. Say you decide to get the Cubis tank, the coils for it are not interchangeable with and other tank. I replaced my mega one tank with the Cubis because it is virtually spill proof and top fill so it's good to drop in my purse and head to work with, it sits on my evic mini. Now on the rx200 I have a HorizonTech Krixus tank which is also a top fill. This tank doesn't use metal coils, it uses ceramic. It ohms out at about .3 ohms and I run it at about 65w to start out a new coil and slowly build up from there to about 80w. It takes some break in time just like any coil. With the Cubis I usually use either the .5 ohm ss or the 1 ohm ss. The .5 ohm has a range of 15-30w and the 1 ohm has a range of 10-25w. You can also get clapton coils for the Cubis that are 1.5 ohm and the range is 8-20w. When you break in a new coil always start low on the wattage and build up to what is good for you no matter what tank you end up with, but do pay some attention to the upper limit. I don't really like Ti because of the possible danger of burning it and letting of toxic gas vapors if you dry hit it. Before deciding on a tank or mod browse through the forum and you will see why others like certain mods and tanks. The rx200 and the cuboid are popular, but there are many others out there with the same capabilities that are just as good that you might like better for you. Just like I liked the rx200 over the cuboid because of how it feels in my hand. If you have a good vape shop close by go take a look at mods and tanks and hopefully the staff is knowledgeable about their products, not just there to make money, but to help you make an informed decision also. You are not ready for mech mods yet so don't even think in that direction for your own and others safety. The tank you end up with will depend on whether you want big clouds or more flavor or both. Both the Cubis and the Krixus give me both, even though I run them at very different wattage. Find a tank that works for you though. I thought I would use the temp control mode most, but find myself using power/wattage mode all of the time now on both mods.
Sorry for the long paragraph but the info should help you understand a little better. A good section to check out on the forum is new vapors. A lot of really good info there. Another good section is mods and accessories. Ask questions in both of these sections. All the sections on this forum are awesome for there own reasons. All members here are happy to help.
Good luck and happy vaping