The most romantic man I ever met only had a high school education but he wrote the best long letters telling me how wonderful I was, how much he loved me and that I reminded him of his first teenage love that was 30 years ago. He made me feel so special.
Do whatever you can to make him feel special. Tell him all the things about him that you love.
Another thing he did was sneak little love notes on post-it's all over the place so days later I'd find them, on the ceiling fan, in a drawer, book etc.
He gave me wild flowers all the time too. I think if you have the flowers laminated into a picture, card or bookmark it would be nice.
It's all the little things and lots of appreciation for them.