you can do any way you want..add fish frist or plants..you lest need a 40 to 50 ml of sand or gravel if going to be planted..
do your hard scape fisrt add water .add plants...wait a week with at lest three to six fish to cycle the tank..then add more fish or plants ...way you go...
remember to do a 20 to 30 % water change weekly..
as for fish placment with thos fish it does mater which way you add them..they not like ciclids..