Its very good question as to how can you get ethereum, and i will answer your question in following steps:
1) the first thing you need to do is open up ethereum wallet, there are hardware wallets, desktop wallets, and web wallets
2) The Second step would be how to get Ethereum in your wallet well you can do couple of things here, you can get ethereum from exchangers or you can mine ethereum and get them directly into your wallet
3) How do you mine ehtereum ?? You need A GPU for mining ethererum you will have to run it 27/7 to make profitable amount
I Hope this answers your question.