Ok, the Hcigar Nemesis is a great mod, totally kickable with a 18650 battery. Would highly recommend getting the Evolv kick 2, to go with it. That way you can regulate you mod, get all the protection of a voltage regulated mod, and be able to fire builds for .5-3 ohms, and crank it to a max of 15 watts. If you try to run a mediocre atomizer on an unregulated mech mod, you are likely to burn it up if you ohms are to low. An Aspire Vivi Nova BDC would be a good choice to start out with a mech mod. It can handle 15 watts and wick plenty well. Then I'd start educating my self about the different types of rba's and find what looks good for you. I am partial to bottom coil rba's and own the Russian, Terminator-C, the UVO Aqua, and have a Fogger V3 on the way.
Check out the micro build section of the forum, and the Nano Dragon build section, these two threads and build are really easy to master, or at least get competent in quickly. And they produce fraking great tasting vape. Building is actually not hard to do. And after a few builds one becomes more proficient. It is quite fun too. Love to experiment and combine different styles. A few tools are necessary. Since you are going Mech mod, you will need an atomizer ohm meter, or any kind of ohm meter. I really like the conveyance of the atomizer ohm meters. Not only are they good for reading you build, but they provide a good platform for mounting and wicking the atty. Also things like a butane torch, tweezers, needle nose pliers, and of course your wire of choice for the coils. You don't need all these tools right off, and can use most of the stuff lying around the house any how. I picked my stuff up a little at a time.
Also get educated on the prober batteries to use, and care and safe handling of batteries, and get a quality charger too. All this information can be found on this forum. Good luck and happy Vape trails to you!!!