Make sure to follow their inspection list, the inspector checked everything on that list, testing every single plug in my property, turn on every appliance, hot water.. very thorough. 

Walk every unit even if you have an inspector.

But no, the City does not send out an inspector to your house to make sure its up to code.

An inspector or contractor ought to be able to give you a decent guess in life left in the roof and hvac systems.

Thanks. ( We are using realtors inspector) 

Furthermore, the only way I can pay him is giving him my credit card info over the phone....he has no online payment portal.I still owe him for the inspection ($435) and am hesitant to hire another inspector right now.

Shop around for lenders, find a property (wholesaler/investor friendly agent), get a team together (contractors/inspector), walk the property with contractor?

More details/example fees: Management Fee: 10% of gross rent collected, $50 minimum per unit.Leasing: One full month’s rent upon execution of a leaseOther: 10% will be added to each invoice for any repairs, maintenance, improvements, landscaping, and snowremoval for the Property 50% of late fees collected $50 lease Renewal Fee $50 per utility turn on $25 posting 3 day notice $100 per court appearance witness fee $50 tenant removal with bailiff or police $50 to meet inspectors for housing voucher programs, occupancy certifications, and/or POS or rentalinspections Broker may charge to offset Broker expenses for postage, key copies and other misc. expenses $100 set up fee $120 annual consortium fee ($60 March 1st, $60 Sept 1St)Given all this, how do I input it when I'm making calculations for a potential investment (do I put this in as >10% like 12%, 15% or 20%?

Seek help from professionals such as home inspectors, real estate agents, attorneys, and accountants during the due diligence and transaction process.

Key questions to ask include:Their experience with out-of-state investors.Knowledge of the rental market in Cypress, Katy, and Sugar Land.Experience with investment properties, particularly single-family rentals.Their network of local contacts, such as property managers, contractors, and inspectors, which can be invaluable for an out-of-state investor.Technology will be your ally if you are an investor from out of state.