Toment wrote:
Sony, Canon, Nikon, Leica, Fujifilm, Panasonic, Pentax, in no particular order
Each is significantly different from the other.
My initial was the Sony a6000. I have graduated to many others, GAS, but its a great place to start.
Other considerations are price, the actual company system you start with, size, ease of use etc.
Good luck.
There's a reason the A6000 (which was introduced in 2014) is still offered by Sony, and is reputedly the best selling mirrorless ILC of all time. For value/features at today's prices it's hard to beat as a starter body.