All Questions can be anwseredby reading the guide. I only anwser the important ones:

1. Knights Badge is the only way to get the blood ore early. And a better weapon makes thing much easier in combat. The Dungeon can be enterd from day 10 after Snow and the Hero went fishing. Without the knights badge it you have to travel to the snow mountain village and potentially buy it or find it in another dungeon. However, considring you got the bad ending of the war, you don't need it. The Sword Axe (40) weapon that can only be obtained by a bad ending of the war  is even stronger than the current best fully upgraded Sword (25 Atk).

2. Bad Ending: The Bull Ending is not the worst among the Bad Endings. The Bull let the Lizard escape, so only a few of them die because of the fire. The Bull Ending is also the only way to get the special S** Scene with Axel: Save the Game on different two slots before choosing your Reward and make one save with S** with Axel to obtain the Scene for your Gallery, then reload back and choose the Sword Axe. In my Opinion: Just role with the Bull Ending and the Swords Axe and play on.

3. to start all over again.....

no big deal, the Game provides ton of savefiles and the tab button to fast foward.  If you play again and want to experience the best peace ending with all benefits, just click the link and  read (only) the following two post:

1. The only requirement for making peace is:  
2. In my opinion the "BEST good/neutral ending":

https://itch.io/t/1392488/good-ending

I recommend to play the Bull Ending; - Kill Nauxus, Bull Tribe wins, have S** with Axel, reload and pick the Sword Axe. Then play on a much as you like.

The special Scenes* with Nauxus can also be obtained by archiving Peace!! Just follow my posted guide and your Eyvind can enjoy S** with Nauxus AND Thane!

Don't be afraid of restarting the game. I played the public avaible content of the game 4 times already with diffrent outcomes and diffrent Stats Points for my Eyvind, just to see the difffrence between high INT/CHA Builds vs Low INT/CHA Builds.