So I got annoyed of Aela the huntress since she didn't want to move in to the hearthfire house which I made. So I ended up killing her. After killing her I got about 300 coins from a courier because of her death. So now I want to marry someone else, so I try marrying Ysolda, after doing the quest for her, I put the amulet of Mara on, but no dialogue shows up so that I can marry her. I go to that guy over in the temple of mara to see if I can talk to him about marriage, and nothing. Only two dialogues. So now I try putting that console command in to try and marry Ysolda, still no luck. I've also tried doing all this with other npcs and no luck with them either. Any ideas?

I think you can only marry one person in-game. But there are mods that fix this, if you take a look at Planet Elder Scrolls.