Hey @Michael Allen Neuman Jr!
This is really a loaded question. A lot depends on your budget and or your time. If you are a new investor then you will have to do a lot more outreach and invest more time. You may have to do things like posting bandit signs, driving for dollars, networking with other investors/wholesalers, etc.
Then you can get into other strategies, like going to the county records office. Pulling or asking for a list (Probate list, Code violations) and write a handwritten letter and mail it to all of them letting them know you are interested in purchasing their property. These lists you pull should have some sort of motivation connected to them. (Probate, Code violation, Foreclosure, etc). You could even purchase a list from list providers and skip trace these lists to get their phone numbers. Afterwards you can cold call them and/or text them (mass texting may go away soon as more and more people are complaining about getting a text from unsolicited vendors and wholesalers).
Once you have some money to invest in marketing then you can start looking at doing more strategies where the seller reaches out to you. This can be as simple as Mailing out postcards, getting a website through Carrot and optimizing your website for search engines (this is called SEO). Doing Google Ads and Facebook Ads.
All of these strategies can work. And what @Jerryll Noorden is saying is very accurate. He is the king of SEO. When someone searches for "sell my house, gilbert, az" and you are number one, you bet you are going to be getting leads.
But not every lead is created equal. (I can write a whole article on this)
If you aren't sure where you fall in these categories or are not sure what kind of budget you need to start, then connect with me if you need help. I'd be more than happy to!
Merry Christmas!