I got your PM. Will post my thoughts here.
For the cardinal tetras and angelfish, the combination is unlikely to work permanently. Angels have a knack for consuming tetras that fit their mouths. Go with rummy-nose tetras, glowlights or Columbian tetras.
For plants, just give live plants a try. Low lighting plants are your best bets and they are easy and undemanding. Stick with Java moss, Java ferns, anubias, Nymphaea lotus and Cryptocoryne sp. They do not require ferts and you can simply turn on the lighting for at least 8 hours.
Since you will be using sand, I suggest you add MTS (Malaysian trumpet snails) to help stir the sand otherwise keep raking it every time you change the water with a chopstick or fork. MTS are also useful as they eat the leftover foods. Extra snails can be disposed or crushed with a hammer and be fed to your fish. Don't use your fingers to crush the snails. Their shells are far too hard.
Angels eat their fry or eggs the first time they involve themselves in parental practice however as they repeat the process, they eventually learn to become excellent parents. Leave the eggs/fry with them so they have an opportunity to learn.