If you're focusing on inbound techniques like SEO, social media, and content creation for a preexisting website, the good news is you don't need very much budget at all. With inbound marketing, the main focus is on creating high quality content that your audience will want to consume, which unless you're planning to outsource the work, the only investment you'll need is your time.
It’s important to know where your traffic is coming from and the demographics of your audience. This will allow you to customize your messaging so that you can provide the best affiliate product recommendations. You shouldn’t just focus on the vertical you’re in, but on the traffic sources and audience that’s visiting your site. Traffic sources may include organic, paid, social media, referral, display, email, or direct traffic. You can view traffic source data in Google Analytics to view things such as time on page, bounce rate, geo location, age, gender, time of day, devices (mobile vs. desktop), and more so that you can focus your effort on the highest converting traffic. This analytics data is crucial to making informed decisions, increasing your conversion rates, and making more affiliate sales. https://www.youtube.com/watch?v=1E1UA4uEhDs