If you are using 8.5x11 paper, 8x10 trays would not be sufficient as the dimension suggests. I would go with 11x14s. I would think any darkroom trays would work just fine. I buy ones from US Plastics. They are a little cheaper than ones at photographic suppliers. Or Ebay would be another source.
For fixer, you can reuse those bottles that other chemicals come in (1 gal). Any 2 liter soda bottles would work just fine as well. Or you can order brand new HDPE bottles from USP again.
I am not sure how others work, but I make new fixer every time I print. So there isn't really a need for storage. I do not think plain hypo lasts that long if I am correct.
Depending on how much to measure, you need to choose graduate cylinders accordingly. I have some 200 ml beakers to mix individual chemicals and one 1000ml to mix altogether. But I am sure you can do the same with two beakers.
Probably you would want to buy a scale. It does not have to be expensive kind. Anything it can measure accuracy of 0.1g would be sufficient for our use.