The best thing to do would be to decide on what plants you want to grow, which will determine your lighting, substrate needs, ferts, etc. Honestly, in a tank that small, I would stick with just a few varieties of plants. The plants in your picture are low light plants, and do not require a lot of "extra" care. Shrimp like moss, if I were doing that pico tank, I would go with the play sand, a nice piece of driftwood, java moss, Anubias Nana Petite, crypt wendtii, and maybe some hygro difformis (wisteria) in the back corner. Other than a root tab in the sand under the crypt, I dosed nothing extra.
If you are going to keep shrimp, you might want to go with R/O water. When you decide on which shrimp you want to go with, look up thier water needs. Shrimp prefer softer water with a lower PH, and don't handle metals, etc in tap water very well. For a beginner, I would stick with the neo shrimp, they are the easiest to keep. Cherry shrimp are very popular, but the pumpkins and yellows are very pretty too. You could keep more than 1 color, but neo shrimp will cross breed, so you could end up with funky looking shrimp down the road.
Floramax is a good substrate, but honestly, with a tank that small, it depends on your plant stock and lights if you need to use a quality plant substrate. It may just cause unnecessary extra nutirents you tank cant eat up. Stick with play sand, or buy a small bag of white or black sand from petsmart. The tahitian moon black sand is gorgeous, and really makes the colors of the plants and shrimp pop in smaller tank.
Here is a pic of my 2.5 pico planted tank right after I set it up. I used black sand. The right back corner is wisteria, left front and under the dw iscrypt wendtii (which had to be trimmed when it got too big) and anubias nana petite on the driftwood. The amazon sword in the back left corner was promptly removed as it grows waaaayyyyy too big for a pico of any size. The hairgrass did ok, but with no dosing and only stock light, didnt thrive, and I eventually pulled it out. I kept the betta and cherry shrimp in the tank until I broke it. :-(
Hope all this helps. Planted tanks are fun!