Welcome from Colorado!! Your lil one looks cute but we definitely need more pictures
Congratulations. this forum is full of helpful information. When I first brought my Boxer home 6 months ago, I had no idea what I had gotten myself into but by the time he turned 6 months old he was turning into the greatest lil guy and I haven't a clue how it happened. LOL. They will test your patience every which way they can but they will give you a truly unconditional love and when you think you can't take anymore, they'll give you those Boxer eyes and woo you right back into their little paws.
Just be patient and consistent with training and you'll be good to go!