Welcome to the forum. Mods are personal taste plus how deep your pockets are. Tinted windows were my first mod but living in SoCal that may be a problem because of the restrictions the state has. No restrictions where I live. It's a great looking car. Wish they had that color when I bought my ride. The wheels look great, I would stay with them until you get tired of them. A custom exhaust is a possibility. I like the OEM body kit but you need a deep pocket. Anyway happy motoring from Thailand. And keep us in the loop on any mods you decide.
Welcome! Nice choice of color! I got the same color too but I got the OEM Body kits included which I think looks great. OEM body kits might be a good start, just not sure how much that would cost you. You might want to go for wheels but the stock wheels already look amazing. I feel that the car already looks great as it is!
I have the same color on nearly the same car. I personally would not do much of anything to the exterior. It looks great as it is. However, I would consider upgrading the exhaust to get bigger and nicer looking tips. Removing (debadging) the rear emblems would help declutter the back, but with your hatch it would be a lot of work due to holes behind the "MAZDA" badge.
Interior wise, I would change out the stock bulbs to LED. The factory bulbs are pathetic (dim and very yellow looking). I changed out the map, vanity, dome, and cargo lights to LED using bulbs from VLEDS.com. There are many other companies as well. My interior now lights up crisp white light at night. I also changed out the license plate bulbs to LED. At night, the plate "glows" bright white against a dark background. Looks cool.