You would have a Deed drafted transferring the real property to the name of the Trust. Then the deed would be filed with the proper County authority. This has different names in different states, sometimes called the County Clerk or Recorder of Deeds.
There is a lot of information missing. Did the Trustee take out the loans for his own use, or were the proceeds of the loan used to increase assets of the Trust. Were the Trustees removed for cause by the probate court? Upon removal for cause a court will usually requires the former Trustee to prepare an Accounting of their actions. This accounting could then be the basis for further legal action to recover assets converted from the Trust.
In Oklahoma, when the probate is completed, the court would order the money you inherited to be held for you by a guardian until you reach the age of majority, or 18. At that time the of the money would be distributed to you. Are you sure that your mother did not leave a Trust providing that you are not supposed to receive the distribution of assets until you reached the age of 25? If not your distribution is long overdue. The executor should be filing an annual accounting with the Court...
How did your landlord get possession of the house? If he has a valid lease that does not restrict him from subleasing, then he can sublease the property to you. You did not state that there was any problem with the property in your question. If there is a reason that you could receive damages from an owner landlord, then you could seek the same damages from the tenant landlord.
Hope this helps.
Your child's name can be legally changed. It is up to the Judge hearing your Petition to decide whether or not to grant your request. You must publish notice of the request as well as disclose to the father and to creditors
The Operating Agreement should reflect the Trustee of the Trust and name of the Trust. You should include in the Company book a Memorandum of Trust so that in the event the Trustee changes, the other members of the LLC would be on notice of who can act as Successor Trustee.