The 80D has Dual-Pixel CMOS AF which means the focus can follow you as you move without seeing "focus hunt".
Canon's STM (Stepper Motor) lenses are MUCH quieter (even in the internal mic struggles to detect any sound from the focus motors) and also a bit faster and smoother then the older kit lenses.
For indoor shooting, you probably do want the EF-S 18-55mm f/3.5-5.6 IS STM lens. Some kits will include the 18-135mm f/3.5-5.6 IS STM lens instead -- also fine but you're unlikely to need that long focal length range when shooting inside.
Lenses aside... something else you might consider (since it sounds like you're primarily going to use this for video) is a good quality external mic.
Internal mics don't have great audio fidelity. The most popular external mic (especially for video such as YouTube work) is a Rode VideoMic. They make several variations. The least expensive is the VideoMic "Go" - it's a budget no-frills shotgun mic. The standard Rode VideoMic (not the "Go") adds a high-pass switch. High-pass causes the mic to ignore low-frequency sounds... those low vibrations are typically things like fans, air conditioning compressors, car engines, etc. The mic will basically just ignore those and that can help cut out background noise that you don't want to hear. Then there's the Rode VideoMic "Pro". This has the high-pass switch as well, but also adds a gain switch. This allows the mic to internally process and boost audio levels so that you do NOT have to do that in camera or in post processing. That might sound like no big deal, but often there's a bit of hiss when the camera has to boost gain or you do it using computer software, but when the mic does it, you get a better job, don't have to boost as much (if at all) in camera or using the computer and the result is usually cleaner sound.
These mics are designed to mount to the camera's hot-shoe (where you'd normally attach an external flash) and use a cord to connect to the camera's microphone input port.