I recommend working with a real estate accountant to get a free cost seg estimate to see if it will benefit you first. 

There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

Working with a team that does all this in house is essential because there's a level of accountability that comes along with it.

It may also affect rental prices, as landlords try to offset these costs.Rent Adjustment: During inflationary periods, mid-term rental strategies should account for shorter leases, which allows for quicker rent adjustments to match rising costs.3.

Know the lenders requirements for the loan types you will need.For instance you may find you need to have liquid cash of 9 Months P&I and 100% of the loan amount as your personal net worth in order to avoid personal guarantees on the loan, and your retirement accounts may not count towards your liquidity.Know the requirements of the loan products for the apartments you want to buy.There are no books for that, that I know of--just lenders info.Because without that all else is just scholastic exercise.Good Luck!

. - Accounting, not mentioned, but make sure you can confidently run the trust accounting and security deposit which is compliant with state code. - VAs, I don't think this is necessary for 30 doors, but depends on how much availability you have and how time consuming these properties will be.

@Kevin Hintz yeehaww interest rates are lower and saving account growing for capital and I have chosen couple of class A and B neighborhood in Myrtle Beach, SC and the Washington DC areas to buy from; also met some realtors and getting familiarized with those area landlord/tenant laws. 

Go to a community college and take classes in accounting, finance, and real estate, math, and work towards a degree.

Personally, I am avoiding those markets for now just for a sustainability and environmental outlook, but I would overestimate for insurance premiums, almost 2x what you think just so you have a buffer.

@Pat Aboukhaled wife & I have thought this would be a great use of failing malls for affordable housing.Unfortunately, as @Greg Scott points out, many people take the path of least resistance, which can ruin the idea.So, you'd want security cameras and maybe even security guards to hold residents accountable.