I was hoping you skimmed through the combat rules at least.<br/><br/>In 5E there are no more actions in combat. You have one action, which is usually attack or cast a spell. You have your move that you can break up however you wish, before, after or inbetween your movement. There is also what the system calls a bonus action you can do stuff with, but you can only take a bonus action if you have something that says you can (for example, using a spell with casting time of "bonus action" or attacking with an off-hand weapon), otherwise you can't spend it. You also have only one bonus action each round.<br/><br/>Things like double moving, charging, withdrawing, etc that were full actions before, now involve spending your action and moving (dash for example lets you move your speed as your action, resulting in a double move).<br/><br/>As for drawing weapons and interacting with objects, you can do it for free no more than once each round, as part of the action of doing something else (drawing your sword is part of your attack action in this case). Drawing a second item however would make you spend your action (and you'd get both items in that case).<br/><br/>Shooting in melee is made with disadvantage, yes.<br/><br/>The sahuagin fishmen came from underwater where fishes come from.<br/><br/>I'll roll the moonbeam saves and damage sure (with area effects there's one damage roll usually that applies to everyone but I'll roll this since it's very conditional and timing isn't just immediate). I'll also check for wild magic surges and effects for auntie.<br/>I will assume she aims the sleep AoE so it won't affect the lower hp sailors before it affects the sahuagin.