There are a lot of good vendors that have some awesome juices it it some of them are expensive and for a beginner that's looking to try a bunch to figure out what they like, that could get really pricey. For a beginner you want to go with a juice vendor that offers sample packs. I prefer the vendors that let you pick your own juices for a sample pack.
I think BlueMist vapor is a perfect juice vendor for someone just starting out. They have a huge selection, over 250 juices and really cheap prices. $5 for 10ml and $10 for 30ml, and that's their everyday prices, not a sale. But they have sales too which makes them even cheaper. You can get sample packs, which I recommend for a beginner so they can try a bunch for cheap. You can get (5) 3ml samples for $10 or (5) 10ml samples for $20. I recommend getting the 3ml bottles to start so then you can get a few sample packs and try more to find out what you like. They also offer extra flavor shots for .50 cents more and you can get all their juices in 80/20 PV/VG or 100%VG (I recommend the 80/20), and all their juices are made fresh. And what I really like about them is that if you find a juice you really like you can get a 180ml bottle of it for $30, which breaks down to $5 for 30ml, which is an incredible deal. That's why I really like BlueMist and their good for a beginner or experienced vapor. They have alot of great juices and their prices are outstanding.
There are other vendors that have some juices that I really like but ordering from only them gets really expensive. For example, alien visions was mentioned earlier, they have great juices and their Bobas Bounty is prob considered the most sought after EJuice but their not cheap and for a beginner that might make it difficult bc they will have to spend a good bit of money if their looking to try a bunch. Even if you get the biggest bottle it's still $53 for a 100ml bottle. That's $23 dollar more than what BlueMist's is and with BlueMist you get almost twice as much juice since theirs is 180ml. Don't get me wrong, I like AVE and just actually placed an order a few days ago but I would never be able to afford to buy from them constantly. And that's why I think BlueMist is good for both experienced vapors and also beginners looking to figure out what they like.
And the one other thing that I really like about BlueMist is they are one of the only vendors, if not the only one that offers DIY flavors for every juice they sell. That's what drew me to them when I first started vaping bc I knew I would prob start making my own juices after I get comfortable with vaping and figure out what kinda of juices I like. So that's one of the things that I really like. With BlueMist, once you figure out which juices of theirs you like, you have the option to just get the flavors of those juices and make them yourself, which makes it even cheaper, from their already cheap prices
) They offer sample packs too, and her customer service is top notch! 
