You is welcome! We have all been new to this at one point.
My advice would be to "hurry up and go slow." You can - and people do - go completely over the top on their first purchases. And many times end up with a pile of stuff they don't like and don't want.
First, find one or two liquids you like enough as an all day vape. Get your base underneath you like that so no matter what, you have a very basic "something" in liquids you know you want to vape. It may sound boring, but if it's effective and you like it that's what is important when you start. I relied on pretty much three flavors in my first nine months of vaping.
One you have your base - those few liquids you can come back to again and again - it's financially "safer" to venture out. If you get a dud that you really dislike you won't feel so bad. It's usually a really bad idea to get like 15 samples from the same place if you have never ordered from them before. Sure, you got a pile 'o different flavors. But chances are that one vendor is getting their flavorings from the same place, and their base PG or VG is going to all be the same. In other words, if you don't like the first three liquids you try from vendor X, chances are you aren't going to like the other 12 you got from the same place either. Stick with small sample sizes on those first orders too. Nothing worse than ending up with 30 ml size bottles of stuff that tastes like YARK!

to you.
Clearos and cartos and attys - and other stuff - oh my!
There is no simple answer to this one. They all have pros and cons. If you like your clearo - that's good. It gives you something that works and you can return to, know what to expect, and reorder. And at least they can be cleaned.
Cartos? Cheap. But in general they don't last very long and cannot be practicably cleaned. They are best used for flavors you know you already like. Once filled, you are pretty much stuck with the flavor you put in there.
Attys? All metal and can be used for "dripping" - all you are doing is putting two or three drops of liquid in there - there is no filler material in an atty. The down side is you have to keep doing that - often. Easy to clean, the most basic method is just running very hot water through it or putting them in a small pan of simmering water. That will get almost all flavor from a liquid out, with a few exceptions like menthols, cinnamon etc. (There are more advanced cleaning methods for attys, but I don't want to get you overwhelmed here.) You buy a "drip tip" to go with and that fits into the end of the atty and gives you a mouth piece to suck on. Attys can also be used with cartridges - they have filler and you put liquid into the cartridge/filler and then stick the cartridge into the atty. That will give you longer run time than just direct dripping.
So whaddya try? All of them! Seriously, everyone experiences clearos, cartos and attys differently. I can't taste much of any flavor at all from cartos - most people claim the exact opposite. They all can produce different amounts of vapor - that's a personal preference. Ask for recommendations, pay attention to reviews, and buy in small quantities until you find the device you love.
Most important: No matter what you are using have your backup hardware. Don't let yourself get caught with only "one or two" of any device on hand because, sure enough, that's when Murphy's Law will strike and your last two clearos or cartos will buy it before your next order is at your door. Same with your batteries. IMO, no one should have less than three batteries on hand.
HTH!