Easiest to care for and keep alive?

I always see clownfish being highly recommend to those starting out, since they tend to be unforgiving when it comes to water parameters not being specifically in like with where they should be.

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Dottybacks are not too challenging to take care of and they are really pretty and eye-catching.

I think most of the fishes that your aquarium shop recommends can be worth going with. Make sure you research on the pairs as this is what you would be making use of for the keeping care of those fishes. I also make sure to watch some of the youtube videos in the same space. It helps you with learning small things on that part.