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As chawry said I think you should wait until you're a high level to do raids, getting into a random game will usually have 27+ and will tend to kick you.
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Ya raid on 24 for first time will be a struggle. We had one in our clan clear it level 24 but we were all experienced and he still died often. 27 is the golden level to do the raid.
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You should definitely get to at LEAST to 27 first. You will die in one shot otherwise. Even at that there are some teams that will kick you for not being 28+. Use all your shards on your exotic/legendary equipment. You WILL get more in the raid so no worries. Best of Luck.