I intend to invest for a long term worth $ 500.
What coins should I choose and do I have to use all my money?
Right now i'm all in on ICON (ICX) . The coin has alot of potential, It's a korean coin who is trying to connect all type of blockchains with a smart contract.
The coins has already preformed magnifecantly and its main-net just got launched 3days ago . There will be a rise in price in 31th of jannuary because they are doing their annual summit where 5 Dapps will be announced . You could do more research about it and judge by yourself.
This is a good video explaining it :
https://www.youtube.com/watch?v=stK35M4Fnsg