Bill:
I recommend that you follow Michael Whitaker's advise. Forget the chairs. Plan to walk as much as you can. If your wife gets tired, put her in the bleachers and leave her for a while. If you are not exhausted when you leave, you haven't walked enough.
I disagree with the advice to arrive early. Don't fight the rush. Let the early birds in and arrive around 9:30 or so. On Thursday the play will go on for about 10 hours, so you are not likely to stay that long anyway.
You can see the pros hit shots at dozens of tournaments. There is only one Augusta National, and who knows if you will ever get back. See the course. If there are some players that you have a particular interest in, follow them for a while. On Thursday, there may be a few oldtimers and foreign players that you may never see again Don't spend long periods of time watching guys hit balls, especially on the par 3's where it is difficult to follow the ball in flight.
Small binoculars are essential on the weekend, primarily for seeing the score boards from a distance. Not so much on Thursday.
If the forecast indicates rain, you can take an umbrella in and check until you need it at one of several check stands. If you must buy merchandise, you can do that early and check the bag also.
If it looks like rain, leave a change of shirt (at least) and a towel in your car. I have learned the hard way by driving home soaking wet. If you are going to need gas, get it before you arrive.
Avoid eating around noon. Early or later saves time.
Everyone has their own preference on what kind of shots they like to see. My favorites are second shots into par 5's. Find a spot on the corner of #13 and under the pines on the left side of #15. You can also watch those shots from behind the greens. Check the hole location of #2. If the pin is right, watch some shots from the fairway below the bunker. You may see something special, like Louie's double eagle (which I saw). It the pin in on the left, it becomes a routine 3-shot hole for almost everyone. Watch a few shots from behind the 7th and 10th greens. Check out the view from behind the 18th tee. That chute is downright scary. Don't dawdle too long in one spot. The 14th green is one-or-a-kind.
Enjoy the day. You can ignore all of the advise and still have a great day.
Jim