Some noob questions about the wallet..
Do I have to update or install the new wallet?
Or can I just stick with the older version?
+ How do I update without losing the coins in my old wallet?
When I update, I just get the new file. I delete the old one and then load the new one. It updates it and keeps the wallet.dat file so that you don't lose anything. I always backup the wallet.dat beforehand though, just in case. I'm not sure if you can keep the old one though.
Yep use standard procedure with every crypto. Backup wallet at least and even wallet directory if you want, before any update and backup on occasion in addition to this as well. There's a good deal of threads about bitcoin wallets around that have some really good suggestions too.