Unfortunately, I have to agree with Ty. If you’re planning on using more than two mics, you need to use a mixer and someone to operate it.
Here’s one type of setup:
1. Each person gets their own lav mic.
2. Mics are run into the mixer. Pan the host mics to the left and the guest mics to the right.
3. Channel 1 on the camera gets the host mics (left out on the mixer), and channel 2 gets the guest mics (right out on the mixer).
4. Mixer operator rides the levels according to who is talking.
The reason you need someone operating the mixer, is that you can’t just leave all the channels turned up, as this will increase the noise floor making your recording sound echoey or worse. Any noise from the room you’re in will increase as well, overpowering the voices of your hosts and guests.
You also need to add a good pair of headphones to your list, like the Sony MDR-7506.
Dave J