The group I play Pathfinder with is about to start this Adbmventure Path, and I have been tasked with playing a cleric. I have chosen an Aasimar for my race but kinda feel it's going to have issues. Any my advice on this matter?
Not particularly? I mean, more important thing is whether your character is able to fight underwater when aquatic combat happens. Aasimar might not be particularly flavorful for the AP, but aasimar are mechanically strong enough to fit most aps.