questions before I buy any shrimp

ok so I just found out about TDS watching a video about freshwater shrimp... and I'm struggling to understand exactly what it is.

just a quick background, I do NOT have shrimp. I am currently cycling a tank right now, it's been about 1 week and I plan to cycle it for around 3 more weeks. I have seachem equilibrium, I have new tank syndrome medicine stuff, a bottle of shrimp trace minerals, I have the master test kit, and the GH/KH test kit all for monitoring the shrimp tank.

am I gonna need to buy a TDS tester thing or will I be fine with just the master test kit and GH/KH test kit? and also, from what is sounds like, it kinda seems like TDS is the same thing as GH/KH... if I'm ever low on TDS, would I be able to use seachem equilibrium to increase it? or is there something else I need to increase it?

also is there any other knowledge I might be missing before I get shrimp? I know about the nitrogen cycle, parameters, temperature, and the tank set up. and I just feel like Im gonna find something else that I had no idea about.

my GH/KH test hasn't arrived in the mail yet, but when it does I'm gonna be testing my tap AND tank water to see what type of shrimp are suitable for me.