Typically, if you use an encoder like the Teradek, your bitrate runs around 5Mbps in 1080p. in 720p your bitrate will be closer to 2Mbps upload - OBS requires more, with more latency. However, be careful messing around if you aren't the STS in your stake. You have a great stream in 720p where you aren't taxing the upload, that is if you have enough bandwidth. If you have a more limited internet at your building, have your STS turn off the WiFi for broadcasts and use the network at the podium. You will not be fighting with all of the members whose phone picks up the Liahona network - which will drop your available access to upload your stream.
A great tool is just using a Webcam and stream via the Webcam connection, like using a Logitech webcam with the mic built in. It will pick up a great cast for members who cannot attend church. the STS should be aware of the letter submitted by the church on Sept 25 about ward broadcasts. If you aren't an STS, seek their help, if you are an STS - use the tools the church has provided to help in all of these situations.