@Benjamin Barredo That's a tricky question. It really depends on how you plan to drive traffic to it. Are you going to do pay-per-click of Facebook ads to drive potential buyers to your page and then try to get them to sign up? Or a Craigslist ad advertising discounted investment properties? Then yes, it's a good idea.
If you're just planning to put it up so that people might stumble onto it from Google or something like that, don't bother. No one will EVER see it. I don't mean that to sound harsh, it's just that there are so many websites out there. People think if you just put a website up people will find it through Google. Your site will end up on page 45,782 when people search for the terms that fit. :)
However, like I said, if you have a plan for how you're going to reach potential buyers and you want to give them a place to land, yes you should absolutely have a landing page.
Do a search for "squeeze page" on Bigger Pockets and maybe on Google and you'll see what people generally use for buyers lists. Here's an article from REI Tipster about one:
http://retipster.com/squeezepagethatconverts/
For now, though, your time may be better spent reaching out to local investors at your networking meetings, getting their info, etc. And you can try to connect with people here on Bigger Pockets who work in your area. Keep in mind, most investors really want to be on your buyers list. They would love to see as many properties as possible in a week, as it's really hard to find deals right now! Some of them won't be serious cash buyers, but that's okay. You can weed them out later.
Also, realtors can be a REALLY good source of cash buyers. And the cash buyers who work with realtors will often pay more than seasoned investors, because they are used to looking at MLS properties that are 90% of retail and considering that a great deal. Seasoned investors want 60-70%. If you come to those people used to 90% with a deal that is 80% you like a rockstar!
Call a few realtors in your area every week and tell them you are an investor who sometimes have more deals than you can handle, and they are great deals for investors. DON'T mention the word wholesaler at first, because realtors seem to run in fear from the term for some reason. :) Tell them you are only interested in cash buyers who can make quick decisions, and the realtor can simply add their commission fee on top of your price when they market it to the buyer. You want to make sure they always get their full commission on each deal. They love that. :) Some will bite, some won't understand what you are doing. And you may have to sort of train these realtors a little bit, as they are not used to working this way, but eventually you will get some that see the value in what you're doing, and that they can make a few commissions a month from your deals. All of a sudden they are your best source for buyers! They'll be jumping in the car as soon as you send them a new deal.
Also make sure you look at the link for cash buyers I posted above. Work your way through a few of those ideas a week and just keep building your list. Never stop building it. The wholesaler with the biggest buyers list always wins! After a while, your list will be so hot that you can go around to other wholesalers and be like "do you have any deals you can't move? If I can bring the buyer would you want to do a 50/50 split on the fee?" Pretty soon you are doing a few JV deals every month and you don't have to do much work for them.