The great news about live streaming is that if you've got a laptop then you've got all the gear you need to start a basic stream or at least to test that it's working for you.
And while you don't need a camera, we're going to assume you do want your lovely faces to be seen by your users.
So let's get started with a few suggestions that can help you get up and running with live streaming.
Laptop built-in Mic - this is your default option. However, for not too much of an investment you can get a great mic for a low cost, so while it's alright to test things out with a laptop mic, we really recommend buying a standalone mic.
Rode VideoMic Go - A great entry level mic that is mountable on a camera or tripod. You're going to be able to stand at a decent distance from this mic and still sound great.
Rode VideoMic Pro+ - If you're looking to make a solid invested, the VideoMic Pro+ is a superb mic
Laptop built-in Camera - Now unlike a the built-in mic, most laptop webcams aren't too bad, but what you sacrifice is portability. If you want some freedom to be able to change your view, then you're gonna need a stand alone camera.
Logitech Streamcam - A great starter camera that has flexibility of movement and high quality.
Sony a5100 - Now if you want to upgrade to a camera where you'll have flexibility on lenses tripods and more, the Sony a5100 is a good starting point. It's not exactly plug and play though so prepare to add some basic camera knowledge to the things you'll want to research.