Those goldfish are usualy baby common goldfish and those are the biggest. Some get to be 12" and live for over 20 years BTW.
It isn't complicated. All you need to do is put de-chlorinated water in the new tank, get some gravel or filter media from a running tank and put that in too and then add the first fish right away.
I don't have pictures but good fish are:
killifish (research them though as there are many types and some are more suitable than others)
guppies, platies, mosquito fish, endler's livebearers (stick to males only and keep only up to 3 maximum)
honey gouramies (keep only one male) or a single dwarf gourami
pygmy cories (group of 2-4), otos (2-3)
spotted rasboras and other tiny rasboras (3-6)
I'm assuming you want a species tank rather than a community (so only one kind of fish).
If you want a tiny community and can get hold of some rarer species, I'd suggest the following:
3 spotted rasbora, 2 (male) mosquito fish, 1 honey gourami/2 pygmy cories (EITHER the gourami OR the cories)
It would be slightly over-stocked but regular maintainance should mean it remains manageable and a few plants with a sand substrate would make it look quite nice too.
It isn't complicated. All you need to do is put de-chlorinated water in the new tank, get some gravel or filter media from a running tank and put that in too and then add the first fish right away.
I don't have pictures but good fish are:
killifish (research them though as there are many types and some are more suitable than others)
guppies, platies, mosquito fish, endler's livebearers (stick to males only and keep only up to 3 maximum)
honey gouramies (keep only one male) or a single dwarf gourami
pygmy cories (group of 2-4), otos (2-3)
spotted rasboras and other tiny rasboras (3-6)
I'm assuming you want a species tank rather than a community (so only one kind of fish).
If you want a tiny community and can get hold of some rarer species, I'd suggest the following:
3 spotted rasbora, 2 (male) mosquito fish, 1 honey gourami/2 pygmy cories (EITHER the gourami OR the cories)
It would be slightly over-stocked but regular maintainance should mean it remains manageable and a few plants with a sand substrate would make it look quite nice too.