Two possible paths do I see, for you to follow. Since I am a proponent of learning to build on a regulated, my first recommendation would be to try and score a DNA30 mod. If you can build and max out the 30 watts, you can do it all. Tough to find, and the china clone dan30 will be hitting hands very soon.
The reason I feel learning to build on a regulated is: safest way to learn, and you can easily adjust your watts burned and not be at the mercy of an off build vaping to high or low. They also have an ohm meter built in, so don't need one right off. But you will find it is advantageous to pick up a ~$20 atomizer ohm meter, more accurate, and more convenient to build on. I do have a dna30 futura, and the thing Vape Rocks!!! Nice to have a great consistent 30 watt vape.
The other path would be, getting a mechanical, and an Kick 2. Reason I recommend a kick 2 is that the kick will turn a mech into a 15 watt capable, regulated mod, with all the safeties of a regulated. Will fire down to 0.5 ohms, so good to practice and develop your builds. Will need an ohm meter also though, but can find a good Nemesis clone, which will fire a kick with an 18650 battery. Then once you have become a competent builder, simply kick out the kick, and bam, "Welcome to the Sub Ohm Zone!!!"
Make sure to get quality IMR 30-35 amp continuous batteries, and a quality charger with a real time volt meter. With mechs, the Vaper is the only safety device, you must ensure and know that the build is good and well maintained, batteries can handle your ohms built, and maintained properly.
rba's to try for first one would be, flash-e-vapor V2, Russian, Kayfun, and Taifun's all are great rba's and an excellent choice. Go with what makes most sense to you.
I enjoy both mechs and high amp regulated mods, love tanked rba's and also mix DIY juiced. Find the vape path the most interests you, and see where it leads.
Vape long and Prosper!!!