1) Yes your inbuilt light will get blocked by the WA convertor
2a) I cannot really recommend any lights as I did not buy any... the ones available locally are either total pieces of **** or far too expensive at 250+ EUR. The micro-advance shoe ups the price by another whopping 30 EUR for the adapter.
2b) Since you use the camera for the same purpose as I, I would advice you to get decent lights in each of the rooms you expect to shoot video. I find it eliminates the need of having an expensive camera mounted light.
2c) As a bonus: put off the auto gain in your camera settings, as otherwise you'll end up with very grainy pictures in low light environment. Shoot in Shutter priority mode and use the quick-menu to manually change exposure. It gives best picture quality. You're going to hate yourself if you find the first birthday videos look heavily distorted on bigger screens... Happened to me, but then again: it was the first actual video taking I did...
lol... and do not even think of filming the birth itself... your wife will most likely not appreciate it... better shoot some B/W pictures... And careful with the flash on the little one's eyes...
