Hey everybody! A relatively new DM here who just finished (or completely failed) a campaign. I made an executive decision to make a new campaign but in the same wild west (kind of) world. I'm looking for a new campaign Idea for my party of 6 beginners. I had a couple of ideas but I dont really have much experience and was looking for some pro input. Here are some of my ideas:

• The king is dead and there is a massive power struggle among (his sons, sub rulers, house members, something else?), the PCs are members of (secret agency, royal guard, military) and are caught in the middle of this. PCs need to choose sides, assassinate people, negotiate, etc
• The PCs are part of a criminal gang and go around stealing stuff
• For some reason the PCs have been confined to a dungeon with a bunch of other people from their city a few years ago and rumor in the dungeon (im not really sure where the rumor came from yet) is that the world is full of great powerful “heroes”. The PCs need to make allies and prepare for when the “heroes” will surely come to kill them all.
• The PCs need to save the dragon from the daddy's money princess who used an army to capture it 
• Some kind of siege of a massive city that the PCs happen to be in. They have to solve problems like resource shortages and stuff
• All the PCs have been recruited by the government which is trying to do something (revive a god, summon some powerful monster) but has to send the PCs on missions without them knowing what for.