Thoughts for a new (to D&D) DM?

These are all just ideas for small episodic adventures for the party to do alongside their main arc and traveling place to place. These are of course just a basic guide for me to build on, but I just wanted some thoughts on these.

Side Quests "Skullduggery" - Stupid "Metal" playing bards raising skeletons from a nearby graveyard for a concert in a cave. Wealthy family who had graves desecrated puts out flyers with a reward.

"Lich's Release"- Warlock/wizard is trying to release a lich encapsulated in a crystal which requires a long-standing ritual which gives the surrounding town nightmares and ailments. The lich's prison is shattered only to reveal that his soul has long since departed as he turns to dust after the Mage is incapacitated.

"Beauty is in the eye of the... Spectator?"-  a spectator has had several underlings kidnapping alchemists and wizards to try and make a way for it to change shape into a human to court a woman he saw picking flowers in the mountain near his lair.