Well you could buy a list and send out some mailers. Then, put a good deal under contract and double close. You don't really go around telling people you are a wholesaler. If you have an awesome deal, which you should as a wholesaler, then you can call your buyers and they'll snatch it right up! When you double close the only thing the buyer will know is that you own a property and they are buying it from you.
(have a title search done before you drag an investor into an ugly mess)
Wholesaling does require time and knowledge. If you don't really have the time or knowledge to do it then I would advise against it or anything else for that matter.
If you are looking for passive income then I would pick a strategy and become educated with it then invest in that area.
You could also buy turn-key(ish) properties at a deep discount using long term hard money then sell it by offering seller financing and doing a wrap. repeat..
The passive income strategies to consider would be notes, rentals, seller financing, hard money lending, and stocks/commodities as you mentioned before. Just pick one and master it!
Gold is HOT right now but it won't be forever. You may want to consider opening a WE BUY GOLD store then reinvesting your profits into rentals.
You may also want to look into Berkshire Hathaway B stocks as they are the best performing stocks over long-term. (aside from BRK A)