One thing I learned in 4 and a half years of
vaping is there is no one size fits all solution. Ask ten vapers what the best setup is you will probably get 10 different opinions. Ask the same ten, six months down the line and you will likely get a completely different set of opinions. Finding the right combination of vaper production, nicotine strength and technique for any one individual is going to be tricky, mostly because as a newbie you really have no idea what you like/want/need. In the end it comes down to trial and error.
Having said that I would have thought any decent B&M should be able to show you some options, let you give them a try, and help you do the initial setting up. No one should be leaving with a set up that makes them choke.