I agree with everything Tam said - but with the Spinner, I start at "standard", which is 3.7 volts, and only go below that if it tastes burned at 3.7.
I would also try out fadoravapor.com, and flatlineliquids.com. I recommend those because they are both VIP members here, I myself vape liquid from Fadora, and I've heard wonderful things about Flatline as well from members of this forum. I don't know about Flatline, but Fadora you can order a sample size as well.