Zebra Tetras??
Tetras can be good but generally, they arent as hardy as others such as livebearers.
Mollies will be too big as will swordtails but once the tank is fully cycled, a trio or so of Platies would be a good one to start with

That way you can get 3 different colours if you wanted and they do come in amazing colours.
Guppies are neither here nor there, some arent very hardy these days, depends on quality. They will also limit which tetras you have as silver tips, glowlights, red eyes, columbians and barbs as well are known for being really nippy to long fins. (some of those tetras would get a bit big for 60L though, as would most common barbs).
Some nice hardy fish are:
Platies
Ember Tetra
Silvertip Tetra (no guppies)
Glowlight Tetra
X ray Tetra (no guppies)
Flame Tetra
Black Phantom Tetra
Zebra Danio
Gold Zebra Danio
Leopard Danio
White Cloud Mountain Minnow
That ought to give you choice to start off with, if you want to add fish like Neons or Cardinal Tetras, i would advise leaving it until at least 6-8 weeks after your tank has cycled and had first fish put in.
Would also say leave algae eating catfish and invertebrates like shrimp until last, you need to have a good food supply before you get them.