What exactly can I do if partner collects all the rent money and will not share as verbally agreed.

Sue partner for partition of the property.

Can one partner sell their share of property without others consent?Can mortgage be taken out on half ownership?

I will check to see how to do that. If it can be done in small claims. Do I need lawyer? I am new to this site so not clear on how to use it. Please clarify name and I will continue to figure it out so as to be fair. Thank You.