Hello
great to hear you have started up the hobby. I started up about 4 months ago and it does get very addictive! This is a great forum and everyone tends to give very good advice here! so thanks guys for that!
When your tank is cycled your lfs (as mine did) will probably tell you that you can add as many as you like in the tank at one time. This isn't a good idea, I would recommend adding no more than five in at a time and leaving at least a week between adding them.
I am so jelous by the way, I have been trying to get hold of bronze corys for ages,
we only seem to be able to get the pink ones! They are best in groups of 3 or more, and as far as I am aware, no fish really just eats the rubbish at the bottom and need feeding like all of the others.
I would recommend seeing the fish you like, coming back home and reading up on them, or asking the opinions of people on the forum, they are always more than happy to help.