PSA: don't play leona or alistar
Seriously, if you don't play a lot of support/adc or are confused on how to play the role theses aren't easy supports to play. They are all in supports which require you to understand when to go in and when not to. Im not even upset that my supports generally go in way to much; its the fact that they don't go in enough. Perfect example is my last twitch game. There were plenty of times for leona to engage on karma and graves but she was to scared i assume so we got poked out of lane slowly. However, we hit six first so i was oh easy all summoners have been broken i stealthed up and ulted them together why leona just sat there at like 2/3 health. These supports are high skill FLOOR supports if you are unsure how to play supports play ones like morgana, blitzcrank, or thresh( yes high celling but low floor imo). Stay away from supports that require more botlane understandings