I know how wives can be. LOL! I got lucky and my wife let me get a 125G. I convinced her that if I was going to spend money on this hobby, I needed to go big. Bigger is better, because any changes in a large tank take longer to happen than in a small tank. A small tank can turn over in a very short period of time, where changes in a big tank happen gradually. This gives you time to spot any problems and correct them.
We look forward to seeing pictures of your new tank. It takes awhile to get it looking like you want. It can take up to a year to get everything filled in and growing, so be patient. You don't want to fill it full of stuff all at once. Do it slowly and gradually so the system has time to adjust. Mushrooms and ricordeas (I prefer floridas over yumas) are great for beginners. They are photosynthetic, so all they require is light for survival. Supplemental feeding isn't required, but it doesn't hurt. I have spot fed mine tiny bits of chopped Gulf shrimp. Zoanthids and palythoas (zoos and palys) can add a lot of color and variety, and are easy to keep also. I occasionally spot feed mine with Marine Snow. The possibilities are limitless, and no two tanks look the same. You will have to experiment with different things to find what you like. With a little determination and dedication, you will get there.