Getting into bdsm

So I would like to get into bdsm more and try it more. I enjoy small things like being choked lightly and gentle spanks. I would love to ease into more like being blindfolded, being tied up, harder spanks, maybe even temperature play. Being told things like "good girl", etc. My bf enjoys being called daddy but he's afraid to be dominant and rough with me because he's afraid he's gonna hurt me and trying new things also makes me nervous. How do I talk to him about being more dominant and bossy and rough? Would love to talk to someone experienced.