You can take the course on this, get the credentials, offer the service on the side and use the skills for your wholesaling/flips.

Hard money interest payments can eat you alive if you're not careful, so I'd recommend getting some more rehab experience under your belt before you use hard money to fund a rehab.So I think that leaves the other two options, buying another ready-to-rent (turnkey) property using the FHA low down payment, or doing a 203K rehab.That's a tougher choice and really depends on your skill and comfort level with rehabs.

If they had the skills to do bigger better jobs, they wouldn't be doing low end partial rehabs for peanuts.

Without knowing anything about you, your skills, your finances, the house, the market, or the future, it's pretty difficult to give you any advice.

My skill level with tools is improving, but not that good. 

Sales will help expand your network and build valuable skills that translate well into the field of real estate investing.

You will learn key skills about finding great deals. 

I keep a small crew of highly trustworthy and skilled engineers all of whom I’ve known for 10+ years.I’ve had great success in working as a contractor for property managers in Chicago, and have recently obtaining my real estate license in Illinois.

I am a fast learner, really organized, and have good people skills.

There's brokers that will take you just to add people to their roster but you will not be able to able to learn the skills to be able to make you good at your job and be educated on the market.