If the 10gallon tank is totally empty, first you need to do a fishless cycle in it before you put any fish in it so the good bacteria which breaks down fish waste can grow in the filter and cope with the fish's waste load, otherwise the fish poo which creates ammonia will just build up and kill them. You can find out how to do a fishless cycle in the pinned articles in the beginners section.
A 10gallon is too small for danios, but 4 or so platys which are quite hardy fish can live in there, be warned though these fish create alot of fry(baby fish) on a monthly basis so having a mixed gender group or all female group can be a problem(females can store sperm in them so can get pregnant even without a male present). Albino/bronze corys are hardy fish or a 2 female mollys would be good. Before any fish though you need to do a fishless cycle in the tank.
You need to find out what type of goldfish you have as many grow massive and will outgrow a 10gallon tank, 1gallon tank is too small for the majority of crayfish to grow up in.