I took the time to break down all the categories from Jay Scott's book on Rehab Costs, and created a check mark spreadsheet that calculates category totals based off his suggested costs for each item and using any required inputs like sqft, item counts/costs, labor, etc.I then review the pics/video my agent sends me and go through my spreadsheet, checking off what I think needs to be done.

Is to camera inspect the drains before purchasing it.

Years ago Matt with Epic Real Estate did a free video series on wholesaling, not sure if they charge now but it was pretty simple formula: find and analyze the deal, get it under contract, assign the contract to an investor and include your assignment fee, get paid :) good luck!

If you have the money, go and find 3 or 4 contractors to get quotes from to fix a house up before you purchase it.Just happened to find this: https://www.realtor.com/realestateandhomes-detail/...One of the main things I've seen people say on other videos is you want to make sure the "bones" are good before you buy as well. 

And I'm watching the education videos as they come out.

Check out You tube videos with Mark Kohler on this topic.  

At least that's what i saw them using in the youtube videos and on the podcast.

Take pictures and videos of what you find... document as much as possible to bolster your case. 

I watched lots of videos.

I watched the video on YouTube that is from about 2 years ago that @Brandon Turner posted.