Well, a week ago I was in the same position you are in now.
And now I have about 80k and gaining more and more with every budget report.
Here what I did:
1- I looted just few villages to make my first 10k and had my first profitable enterprise. Of course that won’t help if you have a big army so just keep as minimum soldiers as you can untill you get a decent amount of money.
2- I managed to get a very high relationship with the king and the most important lords (two lords to be exact) after that I repeatedly ask them for their support to be rewarded with villages that have been taken during a war. If the king supports you then you will have it. After a while I had been rewarded with two villages, one Castle, and Veluca city. Note that i didn’t even participated in the siege of the castle or Veluca. I got rewarded because my relationship with the king the two important lords was very good.
You will get a decent amount of rents from these properties and you can buy more and more enterprises.
Hope this was helpful. And please excuse my English if this reply isn’t clear enough