Welcome to ECF 4thepackers. If you are in the market for your first E-cig, the 510 is a pretty good one to start with. Or, look at some KR808d-1 models. I think you can find both here:
E-Liquid and Electronic Cigarette Shop - Category Listings for around 30 dollars. (Use the 20% discount button before you add something to your cart)
As with any e-cig, you will need spare items, such as extra atomizers for the 510, and extra cartomizers for the KR808d-1.
Also, you will need to order some e-liquid or prefilled cartridges/cartomizers. Refilling is preferred by most over buying prefilled.
Look here
E Cigarette, E-liquid - Vapor Station for sampler packs or
FreedomSmokeUSA
Buy a number of small samples rather than a large container. When you find one you like, order the larger size. Most samples are 3 or 5ml size.
Also, order juice in various strengths. I recommend starting with 18mg or 24mg nicotine.
Hope that helps get you started. This forum is a vast storehouse of information. Ask any specific questions you want. Don't be shy.