HML want you to contribute 10% minimum and usually 20% on the purchase price, 0-20% of the rehab, and you will be expected to pay the buyer closing costs.Be prepared to justify your ARV, most will require an independant BPO or an appraisal before they fund, therefore put a clause in your offers "Subject to financing partner approval" or something like that and count on 7-14 days for this contingency.Finally do your research on costs in your area and be sure to outline details of your intended rehab with line item costsAsk about their draw down procedure.  

And since the title company essentially guarantees this, the proper procedures need to be followed.

Important things such as tax law, remortgage procedure and availability ( as we're not local), buying and selling procedures and so.

Although probates are public information, procedures on how to look up probates vary from state to state.

If it was me I'd probably start by considering holding the property in an LLC and outlining everyone's ownership interests/contributions in supporting documents and including procedures for disagreements, buyouts, etc.  

If both of those situations are "pre-existing" or what some people called "grandfathered", they are usually allowed to remain without any further expansion, like adding more units etc.However, if the second building or the 3rd unit were constructed without a building permit, all bets are off and an "unpermitted" unit or use may not be allowed to continue in many jurisdictions.Both the question of pre-existing and permitted uses should be asked of the city zoning department.And you may also find that insurance and lenders are not willing to work with sometimes either of these situations.We have successfully gotten variances here in PA, but the procedures are governed by state law and local ordinances. 

I'm a clinical team leader at a dental school.  

@J Scott has processes and procedures in place to allow him to manage his properties effectively in short period of time.

I'm planning on majoring in Marketing and completing classes to apply to dental school.

Go learn principles of sales and learn how to use procedure to establish and operate a business.