Support Champions

I'm planning on becoming a support main. I love CC and I plan on playing Alistar and Thresh. Though I feel like I need to have at least be able to play most supports. I don't like playing AP but love playing AD. Is playing only AD support bad? I do happen to like Rakan but meh. Leona I am looking into but I don't want a champion too hard. Is it bad to play only AD supports and have only 3 supports I'm able to play? Maybe any suggestions for supports as well. Cheers.
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