Every niche has many forums dedicated to its discussion. All that's needed now is to find the forums that get the lion's share of the traffic in your niche so you can put your plan into motion. That may sound like a very long time, and if so then maybe you believe all the sales letters. Alas, you will have to put more than a little time and effort into it if you really want it to pay off for you. When it's your business on the line, you'll have to decide how to proceed.
Of course there are some pages that are vitally important to take note of before beginning your marketing. One of which is the TOS or 'terms of service' page. This is where you'll find all the things that can make your experience a long and profitable one. Violating their TOS can get you banned. It's not about whether or not you've read them. They exist and you're responsible for knowing about them. Either way, they feel like it's your responsibility to know the TOS, and it is when you think about it. That's why it's so important to read and understand the TOS before check that you get started.
Your first step in forum marketing involves building relationships with the members of the view publisher site forum. This is just another form of networking building. But it's helpful to think in terms of relationships because that puts it in a better frame. They payout for building these relationships is that people are more comfortable doing business with people they feel they know. Everything you do in the forums needs to be done with this in mind. If you're serious about building forum relationships you'll want to keep familiarity in mind. You have to keep coming back day after day and week after week in order to build those relationships.
Take a little time to watch and figure out who's considered important on the forums before you even think about starting to network. Most of the time there are a few people who could easily claim this role. Of course, the size of the forum, and its membership, will have some impact on that. Forums that have a lot of members and a long history will have more people with influence. This is something that isn't constant throughout forums. Sometimes it's the moderators who have the most influence. When it's a moderator you'll see a lot of people trying to curry favor. These are the people you want to get to know as quickly as possible on the forum.
Even if you belong to ten forums in your niche, you can be an active member in all of them in less than an hour a day, five days a week. This truly is 'high value' marketing. But just be sure you diversify your marketing so you get all you can from it and help insulate your business from business and web turbulence.