For the oil, I would just buy from Plant Therapy directly. The prices are the same and they are currently running sales on their site, so you may pay even less. That is a good start-up set for oils, as it has a god variety of common oils you may need. Be sure to do some research and look up some recipes you may want to try. That way, you are only buying oils you will actually use. BTW, I heard that 3rd party sellers may alter the oils, or containers. Not sure about that one, but it's what I heard.

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I would also suggest Eden's Garden . While I prefer PT, EG has "choose your own" sets in 6, 12, and beyond. This way, you can bundle cheaper oils in a set and get the more expensive ones on PT. EG is also running sales, but I haven't been paying enough attention to what they are :-/

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The diffuser looks pretty! I got a 700 ml one form Amazon: https://www.amazon.com/gp/product/B073F6DKLF/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1, but this one looks good, too. I recently found a course on essential oil use on Udemy and the guy on their likes water diffusers (like the one you picked out) and nebulzers (more scent and no water, but also more expensive).

I just got this one on Amazon for myself and my mom and I'm actually planning on buying another for my bedroom: https://www.amazon.com/gp/product/B073F6DKLF/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

The this is huge (600 ml) and really easy to use and clean. It runs for 12+ hours on high and diffuses really well. I could smell a synthetic blend (non-EO) all over my living room, dining room, and kitchen (high setting).

I moved it into my bedroom 2 hours ago, put 10 drops of lavender in it (too much :-/) and diffused it for 5 minutes (low setting, much smaller room). 2 hours later, I still smell lavender in here. At only $30, it's way better than many I've seen w/ 1/3 of the capacity.