New player from ZZZ here, which one of these units should I claim?

Finally decided to try HSR out. No idea what I’m doing. However, I have heard that it’s really not a "pick whoever you like" type of gacha and that wasting ressource on some units can lock you out of the endgame.

So who should I pick out of these free ones? Unless they are all useless somehow and it won’t matter in the end?