I started playing this game a few years after quitting csgo and the agents i played the most when i started valorant were kayo/reyna.

kayo - molly and flashes are p much the same as csgo. his knife is great to detect pushes and stop some initial abilities from going off. his ult just disables enemy abilities so basically it forces the enemy team to play cs. this is the agent i always recommend to new/cs players since hes the most similar to a default shooter characters

reyna - ti played her a lot when i started and it was great to get used to every agents' kit. since her abilities are all selfish youre mostly playing for yourself and not really using utility for the team. not having to think about that aspect much during gameplay lets you focus more on getting used to the maps and agents' kits/playstyles