I have reached the place in my campaign where I'm beginning to think of founding my own kingdom.

I'm capable of leading an army of 140 men and have 30 Right to Rule.

I have, however, never tried this before. As such, a few questions to anyone who has:

1. Do I have what I need? Will I need more men in the army or more right to rule?

2. How do I set about starting a Kingdom anyway? I know I just revoke my vows to my current King and capture a town or castle, but won't that just result in the Kingdom I took the estate from showing up with multiple Lords and retaking it?

How would I be able to take a town, hold it, and be capable of expanding? I'll have very few Lords to start with (3 or 4 if I manage a town) and their armies will surely be small and weak. Any strategies?