Hi, I’m holding my wedding in a garden of a house and totally panicking...

Hi, I’m holding my wedding in a garden of a house and totally panicking about everything! It’s going to be smallish affair around 24 of us and I’m having to do the food and decorations myself. Just wondering if anyone else has done this and has any tips? I’m stressing out over how I’m getting the food on the tables without leaving my guests for ages, how to do the flowers and generally how I should plan the day out? The house is near the beach so hoping to have the actual ceremony there (it’s a hand fasting ceremony) any advice would be gratefully excepted!