Here's the deal about advertising: there's a TON of it out there. And so we quickly become tuned out to it. For instance, just think about the number of ads you've been exposed to just in the time you were on this site and bouncing around a couple of threads...
So...for advertising to be effective, you need to have a target audience. That allows you to know what will or won't connect with them. It also means your ad doesn't get lost in the millions of competing ads out there for pet sitting, house cleaning, tax services, daycare, car repair, computer assistance, and a gazillion other services. Additionally, the best kind of advertising is from what are called NCI's: Non-Client Influentials. For instance, if I were a wedding photographer, I'd build relationships with popular wedding sites and wedding planners. So when a bride-to-be visits the NCI asks her "oh, you're still looking for a photographer? I know a good one I've worked with a lot--let me give you his/her card." Your ad to that bride is seen as sales (and we all regard sales skeptically). But when a NCI offers your services to the bride, it's viewed less skeptically.
That's why a niche is critical: you can't identify who the NCI's are until you identify your core target market. And that's also why shooting with family and friends is nice but basically irrelevant in terms of business. As I think it was Darrel mentioned, friends and family won't be honest with you about your performance--they'll say you're golden. And unless one of your parents is head of a major corporation or association that reaches tens of thousands of people you're intentionally targeting, they are not NCI's.
I've known photographers who talk about getting tons of business form FB and others who haven't seen even one call/email. It starts by being clear what your business is about and who you're trying to sell to. Then you advertise as appropriate (and your advertising may actually end up being totally word of mouth depending upon the clientele). Which is why a business plan is critical.
The idea of...get a website, do some advertising...yeah, a lot of businesses do those things. And you may need to do those things. But Jack Welch (former head of GE) used to say "if you don't have a competitive advantage, don't compete." So what's your competitive advantage as a photographer? Why should someone pick you instead of one of the 500 other people within 20 miles of you who have a good camera? I don't mean that to be discouraging, only to say....defining your business, your strategy, your target audience, your marketing approach is critical. Without those things, it's basically a crapshoot. Some photographers make extremely good money. Some do okay. Most go out of business and go in to debt. The failure rate for photography businesses is worse than it is for restaurants. The way to avoid that trap is to not think of this a photography and you want to make money, think of it as a business (selling ice cream, home remodeling services, dental services, what have you). What would you have to do to make one of those businesses work? Apply that to photography and you can make more money.