I know Dolly Wink is recommended very often, and they name their products so you can look them up and find reviews and pictures of what they look like. Pretty & Cute also carries a lot of great brands that you can find reviews for. I don’t use false lashes very often so I can’t say for sure what the best would be, but there are plenty of reviews around for different brands so you can see what they look like and decide for yourself.
Sometimes, but as I mentioned earlier, it’s best to use thinner lashes on the bottom because the way they grow naturally your upper lashes should be fuller and often longer. I recommend looking around youtube for tutorials for applying upper and lower lashes, they may help you decide what will work best.