Gate drive transformer?

Can someone help steer me towards a gate drive transformer? I would like to PWM FETs on the primary side to take 12VDC to 400VDC (and also 5VDC if possible). Ultimately, this is going into a 1000W inverter.

I'm slightly overwhelmed by googling [too much] info. Does anyone have a good article or something I can quickly school myself on? I'm also not sure which parameters I should be choosing. I assume a 1:10 and 1:0.5. What is a Volt-uSecond? Thanks so much!