Will I be rich soon ?
Smart purchase imo
Just don't forget your passwords lol and don't leave them with
any third party exchange or wallet services for any reason
I got them on block chain ? Are they safe ?
Do you mean on Blockchain.info?
yes
safe for short time, if you want to keep them for long time like 5 years make paper wallets and put them in a bank safe, disconnected from the internet and all hackers