Don't apologise, I love vicarious tank-stocking! 60 ltrs= 15 US gallons isn't actually such a bad size. You'd be looking at fish that don't exceed 2-3 inches, but there are quite a few of those to choose from.
First of all, you need to think about how you are going to get the tank ready for fish=cycling. There are two ways of doing this: either using a few hardy fish which means you are stuck with a few hardy species and a certain amount of risk to the fish, or so-called fishless cycling (pinned topic), where you spend a few weeks dosing the tank with liquid ammonia before you add fish but then can choose from most species+ your fish are less at risk.
I am going to assume that you will choose the latter course: if not your choice of fish is really limited to either platies or black widow tetras (danios need a longer tank, and White Cloud Mountain minnows are subtropical).
Then, you want to think about the kind of fish you like. Do you want a school of one species or a few individuals of a couple of species? In this kind of tank, and for the small fish we probably have in mind, it is possible to use the inch/gallon rule= 1 inch of fish per gallon of water, so about 7-8 two-inch fish or more if they are smaller (NB this is not ALL you need to know about stocking).
Most tetras are schooling species, which really means they need to be in a group of 6 or more to feel secure. Good tetras for a new tank might include glowlights, black neons (hardier than ordinary neons)- and the people in the cyprinids/characins forum can suggest more good options. If you go for ordinary neons, it might be a good idea to wait and introduce those last, after the tank has been up and running for a while.
Platies, guppies and endlers are very nice fish, some of my favourites in fact. the only problem is they drop live fry- and they do it like rabbits! They don't school as such, but like the company of their own kind. You need to get the gender ratio right, as they are little sex fiends, but otherwise they are fine.
Corydoras is a nice bottom dwelling species, about 2-3 inch long depending on species. They are schooling fish and prefer groups, though IMO it is ok to keep a group of 3-4 (not less). They are peaceful and friendly, they even have cuddly giggly sex! They like somewhere to hide when resting, and need a substrate of either sand or smooth round small gravel.
Khuulie loaches are another of my favourite bottom dwelling species. another group fish like corys, look like little banded snakes but are very peaceful.
Some fish prefer to live in pairs or in trios (usually 1 male, 2 females). A trio of honey gouramis is another nice option if you want a slightly larger fish. Or, for something more slender, a trio of cherry barbs. You can also keep a gourami on its own, they're not really that sociable.
