Keep your Job! The one thing that kept me away most from making movies was not the little time I had, but the struggle to pay my rent, equipment etc.
You don't have a free mind if you always thinking about paying bills. Use your free time as best as possible and when you starting to get money from it, you can quit your job. I started with event-movies, weddings...it wasn't my passion to do these kind of films, but it paid my rent and my equipment. From the skills I learned and equipment I bought, I started to do my own films and made a Showreel out of it. Thats how I came to the kind of films I always wanted to make (music videos, shortfilms etc.)
I would go with sony. I had tons of canon cameras and used it mainly for photography. Than i switched to video and had the 5dMIII for about 2 Years. It was great but after trying the A7S I sold it immediately. I love that Camera. Especially for Events the low light will make your life much easier. You don't have to shoot at 1.4 or 1.8 all the time to get the picture you want. Just pull up your iso and shoot at 4.0 and you are fine. I do events a lot and loved it since the day i bought it. Canon lenses work great with adapter, but after a few Months I skipped to the sony glasses, mostly becauce of the autofocus. I work with a Ronin most of the time and the auto focus with these adapters was just to slow. Keep that in Mind.
you can get an used A7s for about 1500 Euros here in Germany and for the that Price I think there is no competition.