The wallet is a place where you store Bitcoin. To get Bitcoin you have to buy them, mine them or use a faucet.

1. To mine them at home is nearly impossible today. You need certain hardware to make it profitable.
2. You can buy Bitcoin at many different exchanges.
3. A faucet is a site where you get Bitcoin for watching advertisement. I don't recommend doing this because I think it's a waste of time but you can get your first Satoshi (the smallest amount of bitcoin) there. But beware of scams.