Congrats with the fine acquisition.
I'm in the camp of "hey if a noob can afford it then more power to them".
Unlike an automotive purchase where a Ferrari 458 as the very first car would be unwise. The outcome in that case could be a certain death, due to inexperience. In photography, there's no harm or foul in starting out with the best instrument one can afford. At worst, you got yourself some unusable pictures. No worries. Hit delete, learn, and shoot again.
Av mode (aperture priority) will likely be your best friend to start. Acquaint yourself with what aperture priority
means. Let the computer worry about iso, exposure, and shutter speed, all the while being aware of what those values were given. They will add to your understanding of how they affect each pictures until eventually you can start playing with those values too (e.g. Manual mode). Even then pros don't always shoot in manual mode too, so don't get caught up with the saying, "you're not a real man until you shoot manual"
. Rubbish! Having said that, there will be situations in which manual mode is the only way to take the optimal picture.
Most of all, remember to have fun!