Go for danio's, tetra's, coreys, barbs and fish like that to start with, they will die and fight but they are cheap.
When you have the hang of it start looking at the more spectacular fish.
I have two big fat clown loaches which are about 6 years old, they follow my fingers and splash for food when they are hungry

I also have a big pleccy.
Sometimes I stick some tetras in for colour, but my loaches and plec are the mainstay.
I find changing the water lots and having a "clean" tank upsets my loaches, I use filtered water to top up and only do a 20% change every 3 months or so.
I clean the filter weekly and make sure it breaks the surface of the water and has good flow.
This seems to work for my fish.
That's the knack really, finding out a routine and set up which works without being a bringer of death
