I recommend Badger and Badger in San Antonio. 

For flipping my accountant recommended an S-Corp (flipping income is handled differently and so is insurance).

Most realtors I deal with recommend 1% earnest money to their clients/sellers.

In this scenario I'd recommend approaching your lender first and getting a bank appraisal on the property to figure out how much $ you technically have to maneuver with. 

It's great to have you here.Here are some recommendations for you:Find and connect with other BP members that are in your area: http://www.biggerpockets.com/m...Set up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/a...Read Beginner’s Guide: http://www.biggerpockets.com/r...Check out BP Money Podcast: https://www.biggerpockets.com/..Wishing you the best!

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Here are a few areas we like to recommend to investors: Cheviot/Westwood“Stable” sales market with predictable rental income and stable tenants.

What are some strategies you recommend to avoid Saturday check-in or check-outs splitting the weekend? 

Can anyone recommend any agents in the Bronx/Westchester area?

Section 8 can be very profitable if you know what you're doing.I strongly recommend getting some training on section 8 policy in your area - like @Deb S. says, contact your local housing authority for workshops & training on how to work with them.