This is all the stuff I have learned from a couple of really good ppl on this site when I took my first plunge into HV devices.
#1. if you have never used a HV mod device it's better to work your way up from a 3.7v to a 5v then a 6v. Jumping head first is a easy way to either hurt yourself or the equipment you purchase.
#2. Make sure you learn all there is about a device like the spec and requirements, esp. the safety features it has. Watch and read review, how to, etc.
#3. Know your batteries and don't be cheap about purchasing quality because remember the better the quality the less likely you will be to hurt yourself. Vaporflow is a good site for batts.
#4. Make sure the charger you buy is the charger your batteries take. This prevents overcharging and vaping at volts that are higher then what it's labeled as (ex. 3.7v batts in the wrong charger will charge to 4.2v, some device use 2 for a 6v mod but two batts charged to 4.2v would make your vape 7-8v which equals instant atty bust). So get a charger that has setting to regulate charges.
#5. If you use attys on a HV device get HV attys. Check the ohm and buy accordingly. DO NOT USE LR ATTYS ON HV DEVICES! Be careful when using cartos on HV devices. What ever atty or cartos you use make sure to keep them wet. I have a 5v that I use cartos on but make sure to fill with drops after every vape session (10-15vapes).
extra tid bits.
*LR attys are said to make 3.7v mods feel like a 4.5 to 5v vape.
*AW make really good batts
I can totally relate to you though. I was so eager to jump head first into HV vaping and if it wasn't for the ppl on this site I'm almost certain that I would of either hurt myself or broke my mods. So just be safe about it and do your research and you'll be fine. A couple really good members on here to ask question to are NebulaBrot and Blaze. They are the two that held my hand through my journey into HV mods. Hope this helps.