LordEntrails
Hero
I would make it an improvised weapon attack with disadvantage since the item does not fly well. So, 1d4 bludgeoning (because it's NOT going to hit point first) with disadvantage.Following on from this topic; what do you do if a player throws their melee weapon, like if they want to throw their longsword at the enemy. What kind of attack roll would you have them make?
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As for the OP, as others have said, don't be married to what's written. Also, how do your players know its a side quest? HAve they read the module or played it before? If they have, don't be afraid to go off book and change it up, also, you can talk to them out of character and tell them that they are meta-gaming too much and will ruin the experience for everyone.
Improv is really tough. Especially if you want to learn/practice it on your own. You can google some improv techniques for acting which will help, but they all require another person to interact with.
All that said, you have done the single most important thing to become a better GM; realize that you could do things better and decide you want to.