Unless the properties are in close vicinity for easier management, I suspect they will sell individually.

There are a wealth of knowledgeable individuals on this site with many years of experience in building wealth through real estate investing who are happy to answer and help driven new guys discover the way.

However I do not work with individuals who use multiple agents.

They have way to many properties to deal with them on a individual "Special Case" basis.It doesn't matter if the current owner of the property has marketable title.

However, most of them (if not all) actually do not have a company and will do this as a non-license individual.

I am not sure if a concrete guy will do a retaining wall assuming you want the retaining wall blocks. 

Are there any pros/cons to forming a Series LLC rather than multiple individual LLCs for each property?

It all depends on how bad your credit is and why it is bad but the company that I use can get your score up (again the time it takes depends on your individual situation), it will cost you $87 per month.  

There are some good calculators on the web such as the following that will help you rough the numbers for such comparisons, but you should always consult with your licensed tax advisor before doing a Roth conversion as there are so many factors specific to your individual situation that come into play.Roth IRA Conversion CalculatorAs for flipping houses in an IRA (Roth or Traditional) this is something that you can do so long as you keep your involvement administrative in nature.  

As a college student and aspiring investor while at the moment obtaining my Real Estate License in Maryland, I am looking to connect with other like-minded individuals.