You already have almost all that you need to get started except for the fertilizers and plants.
I'm just not sure where the stock lights will be categorized at (low or medium light)
If you do not wish to upgrade anything, then pattern your plant choices based on the lighting you have to be sure your plants can be supported.
I do not have experience with pfertz since I use seachem flourish line but they seem to be easy to use.
Just a specific number of pumps per gallon/s water. They surely come with the dosing info in the bottle.
You can start with the recommended dosage they have and adjust from that depending on the response you see from your plants.
I think you can skip the root tabs as the the substrate is already good by itself but it will never hurt adding root tabs too.
Try the search button when browsing through the different sub forums(equipment, lights, substrate etc)
There are tons of useful information you can find there.
That's what I did when i was just starting and it is a good resource.
Welcome to TPT.