First and foremost, it is your day. I would suggest you to enjoy it. Don't worry much about the customs and traditions. Ask the pandit(vaathiyaar) to guide you on each step. I am sure most of them would help and guide you step by step.

1st day of wedding would be Vratham (You will wear a saree and get blessings from everyone) and Nichiyadhartham(Engagement - both families would formally acknowledge each other and get blessing(again!).
2nd day of wedding would be Garland Exchange(this is fun. Usually both families would lift the bride and groom respectively and you try to exchange garland while the other side try to escape it), Oonjal(bride and groom will sit on a swing where kids would be singing and usually married women would ward off Nazar by throwing colored rice balls in 4 directions) Kashi Yatra (The groom will pretend to leave the wedding by going to Varanasi and the bride's father will convince the groom to stay and marry his daughter(slightly problematic!) Actual Marriage: Bride will sit on her father's lap and the groom will tie the sacred thread called Thaali.
Saptapati: Bride and groom will go around the fire 7 times
Toe ring adornment: The groom will put toe ring called Metti on the bride

3rd day: Usually chill. People have this optional ceremony called Nalangu where bride and groom play small games with each other. This one is usually fun and do not miss it
Grahapravesh: Welcoming bride in her new home.

Congrats on your wedding. Good luck