dudeee, there are a lot of great vendors in the vendors list here on ecf (for juice) ordering from heathersheavenlyvapes, rawrvapor, bwb, coppercreek, momandpopvaporshop, mrstsbakery, vaporbomb, aliceinvapeland, nicquid, all of these are great vendors.
as for an atomizer, are you leaning toward a rebuildable? the bully or the phoenix are great dripping attys. the gotvapes birkshire is a great genesis that you can try SS wicks in, and it doesn't come precoiled... (but its large, heavy, and not so great for n00bs) or the griffin is a good DID clone as well... uhh I have a hebel, which is a dripper, and I like it a lot. I think its also called a rainbow...
you might want to get a couple cartomizers or a couple prepunched cartomizers and a carto tank. thats SUCH an easy set up for a noob and I know you'll love it. dripping can get really monotonous and annoying every 10 hits you have to re-drip. ugh. lol. it is great for tasting juices because the taste is very pronounced in attys, but cartomizers or tank systems are just so much easier. My favorites right now are the vivi novas and cartomizer tanks. I don't take my birkshire out much because its so heavy and annoying to refill lol, but its a great clean vape with the vertical stainless mesh wick. coils can be hard to learn at first though.
I definitely recommend a vivi nova or a vivi nova mini, or a carto tank with extra pre-punched cartos, and maybe 1 rebuildable atomizer, or just a normal 510 atomizer.
For flavors, thats up to YOUR tastes and what YOU like. I personally like baked goods and tobaccos and caramel/vanilla/nutty tobaccos for the most part, with fruit or fruity tobaccos for a switch every once in a while. So, when I buy juice, I buy a bigger bottle of tobacco, a bigger bottle of baked goods, and then I buy some candy or fruit flavors in smaller bottles. Your new, you should buy a BUNCH of all the flavors you think you'd like, as many as you feel comfortable paying for, in as small bottles as you can buy them in, sample bottles. then buy the flavor your pretty SURE you'll like in bigger bottles. If you know you LOVE watermelon and watermelon candy, get a bigger bottle of watermelon. If you THINK you'd like snickerdoodle cookie, get a sample bottle of it.