I started with an npro aka rn4081. I still use it occasionally.t's only downfall is the small cartridge size. To add juice I'd push a flat tooth pick up though the air hole pushing up the liitle white cartridge and fill that with ejuice as well as a couple drops on the bridge of the atomizer. It does put out tons of vapor but not with the stock cartridge's. Do a search here on the forum for Npro there is a whole thread specifically about this model. It's not widely used or was a starter for lots of members, but like I said it can be a great vape. Best of luck to you. As far as juice there are tons of suppliers listed,as far as usa type made juice I would recommend tasty vapor, Geoff will gladly answer any questions especially if this is new to you and he has more than fair prices, I also use Dawn's DIYYflavorshack.com but I hear she;s currently in the hospital. I myself do not like any of the Dekang or China made juice, they can be cheap but not as good as TV's. Happy Vaping!! I'm sure others will chime in.