Try renting or borrowing DSLR bodies before you buy them. For me it is always a touch and love or touch and not be touched thing with cameras.
Last buying decision was between a D600 and a D800E. After one week of heavy usage the D800E had to go, although she had many features I really liked, esp the low light AF compared to the D600. An emotional thing and a question of handling.
Later I tested the Df, the D810, the D750, but the D600 prevailed as my most used body.
Welcome. I am sure with the knowledge and experience you find the equipment you like. We have Sony, Olympus, Leica and Fuji shooters here as well.
Feel free to contribute!