The process of sending bitcoins is very easy. In two words, you need to send receiver's public Bitcoin address in your wallet, specify the amount, confirm address and send.
Once your wallet is downloaded and activated you can add some bitcoins via credit card or with a Bitcoin Exchange. Keep your private key secure and never lose the device on which the wallet was installed.
Download an app or program Bitcoin Wallet which allows you to send and receive bitcoins. There are many wallets across various platforms. While their features vary, their functionality remains.