for me  a handful since early 80s  now in those days I was ONLY buying land that had owner contracts on them. 

This is much lower than the costs associated with refinancing.Benefits of Mortgage RecastingLower Monthly Payments: The most immediate benefit is a reduced monthly payment, which can free up cash for other financial goals.Save on Interest: By reducing your principal balance, you’ll pay less interest over the life of the loan, potentially saving thousands of dollars.No Credit Check or Appraisal: Unlike refinancing, recasting doesn’t require a credit check, income verification, or home appraisal, making it a quicker and simpler process.Keep Your Current Interest Rate: If you have a favorable interest rate on your current loan, recasting allows you to maintain it while still lowering your payments.Drawbacks of Mortgage RecastingRequires a Lump Sum: Not everyone has the cash on hand to make a significant lump sum payment, which can make recasting inaccessible for some homeowners.Doesn’t Shorten Loan Term: While your monthly payments are lower, recasting doesn’t reduce the length of your loan.

These start failing after 50+ years, causing lots of backups and problems.

I started out with little to nothing when I was in the Army and building up properties slowly. 

I'd start with picking one city and spending a lot of your time to do a deep dive building relationships and learning different areas.

My brother and I have decided to join this community in hopes of getting a good start in the world of Flipping. 

Will start to investigate those areas more I’m also interested in looking into areas like Sharjah and Ajman.

I started by patching about a dozen (not small) holes in the wall, re-doing all the drywall in the bathroom, installing new shower plumbing, putting in recessed lighting, installing seamless LVP throughout, texturing/priming/painting all walls, installing new 5 inch pine baseboard all around, and installing custom bathroom vanity/pantry cabinets, and hanging new custom shaker doors in the kitchen.

How long are you usually spending on prep before you hand it all off to your CPA?

I would look at multifamily meet ups in the area to start.