A lot depends on what plant species you want to get. Plants like java fern and marimo balls can survive in nearly any tank, while a plant like baby tears will die without high light and CO2.
For my "basic" lowtech planted tank, I bought the following...
Fluval Ebi tank-this came with 1 bag of Fluval Shrimp Substrate (enriched for plant growth), 1 Fluval canister filter, 1 Fluval 13 watt light (designed for plant growth), and some shrimp supplements. The shrimp supplements were pretty useless to me, so I set them aside, and used everything else.
I also bought a second bag of substrate and a second light for my initial tank set up.
I bought Seachem Prime (water conditioner), and ferts Seachem Flourish, Excel, and Iron to dose into my tank.
For plants, my first shipment was microsword and java moss. I killed both. My next shipment was water sprite, duckweed, green and purple camboba, anacharis, and some sort of unknown plant. Everything except the anacharis is still alive. My 3rd shipment was Cryptocoryne retrospiralis (2 of 3 stems died), Cryptocoryne parva (still alive and healthy, although VERY slow growing), Cryptocoryne wendtii (died), a dwarf lily bulb (VERY hardy and fast growing), and Dwarf Hairgrass (alive and looking semi-healthy). My 4th shipment I bought more DHG and more purple camboba, all of which is alive...for now.
Hope this helps! FWIW, the plants I picked are not really what one would consider the easiest plants to grow, especially the DHG, but I have a vision, and I'm sticking to it.