Timers like Livesplit and WSplit are just regular programs you run. Once they're running, you right click and hit "add splits" to add whatever splits you want. You can also mess around in the settings to customize things like hotkeys for controlling splitting and whatnot. If you're using Livesplit, it has a TON of features to customize the look and feel of the timer/layout to your liking. You can look around in there for quite some time and mess around with what you think looks best.

After that you just capture the program in your broadcasting software and you're good to go.

Thanks you so much!