First of all, it's great you have made up your own mind. Don't let other people get you fooled, since nobody can predict where any of the coins go 
Secondly; it's very smart you've bought a hardware wallet right away! Ledger Nano is also very handy and easy to use. However, you'd check what coins Ledger Nano supports first. It doesn't help you to buy coins you can't store in it. Check from here: https://ledger.zendesk.com/hc/en-us/articles/115005304449-Which-altcoins-and-tokens-are-supported-by-the-Ledger-products-
You manage your coins in Ledger Nano like you'd manage them in any other online wallet. There's a software you install to your desktop and then you can send/receive any coins it supports.
Secondly; it's very smart you've bought a hardware wallet right away! Ledger Nano is also very handy and easy to use. However, you'd check what coins Ledger Nano supports first. It doesn't help you to buy coins you can't store in it. Check from here: https://ledger.zendesk.com/hc/en-us/articles/115005304449-Which-altcoins-and-tokens-are-supported-by-the-Ledger-products-
You manage your coins in Ledger Nano like you'd manage them in any other online wallet. There's a software you install to your desktop and then you can send/receive any coins it supports.