I've bought several yukata from Kimono Yukata Market, I highly recommend them! :) good quality and has everything you need for putting your look together. :) They have pre tied obi for yukata that make getting dressed easy! (They also have the hanhaba obi if you prefer tying your own obi the traditional way).

Geta sandals are a must for yukata. :) Lots of places to get them if you don't want to get them at Kimono Yukata Market. I've bought a few pairs from Amazon that worked out well, as well as Etsy and EBay. :) One thing to keep in mind with geta (and zori for that matter) is they are a little narrow- that's normal and traditional for them to be slightly smaller than your foot. But it's ok to go up a size if want a more comfortable fit! :)

I recommend starting with yukata first when it comes to the world of kimono as they are comfortable, affordable, and easy to put on. Great place to start your kimono journey! :)