@Ryan Faller
Here's a good place to start: https://www.biggerpockets.com/renewsblog/2015/01/3...
Also: https://www.biggerpockets.com/renewsblog/wholesali...
I think the most important thing to note about wholesaling is that it does not have many of the benefits of other real estate investing. There is no long-term income, depreciation etc. Most newbies are attracted because of the low barrier to entry but realize you WILL pay with either time or money. If you don't have any money you're the one who is going to have to be using your time to source properties. It can be a full-time job.
Most newbies also don't realize the skills necessary to do a wholesale deal. First, you have to have the marketing skills to get a motivated seller on the phone. Then, you have to have the negotiation skills to buy the property at a very steep discount so that you can make an assignment fee and the end buyer still has meat left on the bone. Then you have to have a buyer's list with legit cash buyers who can actually close.
Wholesaling can be a great business but the ones doing the best treat it for what it is, a transactional business. You're only as good as your next deal and you constantly have to be sourcing deals.
Don't get me wrong, wholesaling is a great source of income but most newbies don't treat it seriously and get the expected results.
To answer your other questions, yes you can start with no money but you will have to be using your time instead. I would rather pay the money!
It is true that you can find all the information you want online especially on BiggerPockets but also realize that, if you find a legitimate coach, to walk you through the pitfalls, it is well worth it. Especially for something like wholesaling where accountability and mindset are of paramount importance. It can be a brutal business.
Jut my .02 cents.
Do with it what you will.
Good luck!