Reddit mentions of AmScope T490B Compound Trinocular Microscope, 40X-2000X Magnification, Halogen Light, Abbe Condenser, 2-Layer Mechanical Stage, High-Resolution Optics, Awarded No. 6 Among The Top 10 Microscopes 2016

You won't be able to see molecules like antibodies, at least not with a light microscope. If interested in why, you should check out pages such as this one explaining the limits of resolution (about 3/4 down the page).

You won't be able to diagnose health disorders via blood draw and light microscopy without the proper tools (you might see evidence for super obvious ones that depend on morphology or cell counts, but that's not a diagnosis). I'm not a clinician, but my guess is clinics use stains, qPCR, ELISAs, things like that, to diagnose.

That said, you should be able to see things like cheek cells or RBCs, with a decent 20x or 40x light microscope. It's likely you won't be able to see more. I had one when I was a child, and it probably didn't cost more than a few hundred $. Here's one that's not wonderful quality, but it looks like you can get some decent magnification and it even has a phase add-on (except one review says the add on is unuseable).

Thanks for the advice! I was looking at this particular microscope which does have the vertical attachment.

As with everything I have had to purchase for all of my hobbies, it is not cheap, but I am willing to pay a premium for something if I can use it for life.

If I were you, I'd go with a microscope that has a trinocular view. It really helps to be able to view what your are taking images of through an eyepiece.

This is the microscope I use and I have no complaints yet:

https://www.amazon.com/AmScope-T490B-Magnification-High-Resolution-Microscopes/dp/B004QEFO1Q/ref=sr_1_3?s=electronics&ie=UTF8&qid=1524069091&sr=1-3&keywords=trinocular+microscope&dpID=41a90GOXjiL&preST=_SY300_QL70_&dpSrc=srch

You can get decent photos / videos using a phone adapter if you're on a budget.

Something like this perhaps:
https://www.amazon.com/Gosky-Universal-Phone-Adapter-Mount/dp/B013D2ULO6/ref=sr_1_4?s=electronics&ie=UTF8&qid=1524069164&sr=1-4&keywords=microscope+phone+adapter&dpID=41riC-uLXTL&preST=_SY300_QL70_&dpSrc=srch

Here is the mobile version of your link

There are some decent Amscope scopes on Amazon. I got something like [this one] (https://www.amazon.com/gp/aw/d/B004QEFO1Q/ref=mp_s_a_1_2?ie=UTF8&qid=1500439482&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=B007LBETCQ%7CB004UMDLAA%7CB00AM5XB5O%7CB005O0XVTS%7CB00AZOICT2%7CB009JROROU%7CB004QEFO1Q%7CB007LBETCQ&dpPl=1&dpID=41a90GOXjiL&ref=plSrch) a few years back and I actually prefer it over my clinical lab scope at work. It's really quite heavy and sturdy, so I don't hesitate to let my sons play with it. We go "bear hunting" in the backyard after it rains. You can connect a digital camera to the trinocular piece on the top. Amscope sells those, too, but they are usually a low mp. I got the Canon converter and attach my Canon 6d to it.

I'm sure your daughter would love it! My kiddos are always bringing random things home to look at under the microscope. They could spend hours with a little cup of pond water.

Anytime. FWIW, I've got one of these that I use for my own DIY bio projects around the house. It's not the greatest in terms of optical quality but I was really impressed with the build quality/value since I think I paid about $150 for it.

https://www.amazon.com/AmScope-T490B-Magnification-Illumination-High-Resolution/dp/B004QEFO1Q