I wouldn't worry about killing your first deer this year. Won't happen!!! When that moment comes, you'll be shaking so bad you won't be able to even draw your bow. You may even pass out!!!
I'm just messin with ya!!!
First thing I do is draw my bow back in the stand. Last thing you want to find out is something that will hinder your shot when that moment happens. Next, I nock an arrow and put my bow on my hanger. I then position my bow where all I have to do is ease my hand up to the grip. Don't know how many times I've had deer on top of me in a split second. So, easy access to your bow with little movement is essential. With that said, learn to shoot sitting down. If wind don't bust you, movement will every time.
And since you're just getting started, practice, practice, practice, and then practice some more. The reason why is what I said in the beginning. You will be shaking, can't breathe, your heart racing, and be feeling like you will pass out. You will forget EVERYTHING you have ever learned. But once you get to full draw, the shakes will go away and you will be able to breathe. And all that practice time will kick in to auto pilot and you make the shot!!!