If you love to travel and find yourself randomly searching for airfare sales or browsing Lonely Planet, why not carve out a niche for yourself as a private travel agent? My friend, Mark Jackson did just that, making extra money online with his travel consulting side business. Start with word of mouth recommendations from friends who know they can count on you for the cheapest flights, and then move on and create a Facebook or LinkedIn group to invite people who want to stay on top of the latest deals. Eventually you could spin this into a full-time consultancy teaching people how to make their dream trips a reality.
There are many ways to get people onto your list. Lead magnets are one such resource. For example, you can build ebooks, checklists and cheat sheets. But you can also do content upgrades, such as PDF versions of an article with added resources in them, four-part video training series, and more. Think about your audience and what you can offer them to better serve them, then treat them with some respect and you'll eventually reap the rewards.
This mainly happens through digital channels, using inbound marketing techniques and a little bit of old-school outbound marketing (more on that in a minute). Buyers today do so much online information gathering on their own, they’re not so keen on listening to traditional sales pitches. Instead, companies have to meet prospective buyers on their own turf: the internet.
The audiobook industry is booming, yet only 5% of books ever get made into audio format. If you’ve got a background in acting, or if people have said you’ve got a voice made for the radio, you can make extra money recording audio versions of independent and popular books. Sites like ACX connect authors with audiobook performers. So, whether you’re an author looking for more ways to sell your book, or an actor/voice actor looking to make some extra income, you can sell your services online.
If you're ready to enter the ecommerce fray, you could sell your own stuff. Of course, along with selling your own stuff on your own website comes a whole slew of both responsibilities and technical configuration and requirements. For starters, you'll need a website and a hosting account. You'll also need a merchant account like ones offered by Stripe or PayPal. Then you'll need to design that site, build a sales funnel, create a lead magnet and do some email marketing.
Developing a strong internet presence is a key part of lead generation. This is often accomplished using inbound marketing techniques like content marketing, website forms, and search engine optimization. These are topics unto themselves, but they boil down to using content that you publish to drive prospective customers back to your website. The digital age has made it easier for companies to research and understand their prospective leads. When you get a bead on what buyers want and need, you can tailor your online presence to better draw them in. From there, it’s important to develop and nurture relationships with them, which we’ll talk more about in a later section of this article. 
Cost per click advertising (e.g. AdWords, Yahoo! Search Marketing) overcomes this problem by charging advertisers only when the consumer clicks on the advertisement. However, due to increased competition, search keywords have become very expensive. A 2007 Doubleclick Performics Search trends report shows that there were nearly six times as many keywords with a cost per click (CPC) of more than $1 in January 2007 than the prior year. The cost per keyword increased by 33% and the cost per click rose by as much as 55%.

Search engines also provide lead generation options. Any business with a website can appear on a search engine listing for related searches, and visitors can then click a link and be taken to that company's website. However, some search engines also offer a pay-per-click lead generation option. The search engine posts a link to the company's website at the top of the search results form, making it much more likely that prospective customers will choose to visit that website. However, when a visitor does click the link the search engine charges that company a small fee, as opposed to the free 'general' listings. Companies that use pay-per-click advertising are advised to move cautiously at first, as an overly successful campaign can end up costing far more than expected!
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