First of all, start with the most basic things like the speed. You have to make sure that your visitors do not wait more than four seconds for your site to load because most of them will leave your site and it will increase your bounce rate and show Google a bad experience thus lowering your rankings.

Another thing important with the cam sites is to use more than one sponsor on it. Why? Because if you just use all the models from the one affiliate program like Chaturbate for example, it might make Google algorithm flag you as a duplicate content (just like the white label) and give you less organic traffic.

So if you add more programs, your website will have more models and people will have girls to choose from and Google will see your site as a more unique one and not just another white label.

Backlinks are also important for the SEO but you should get links from similar websites that do not have to be from the exact niche, but need to be somehow related (like getting a link from an anal video tube for your anal webcam site since they target similar keywords).

I firmly believe that having a one backlink from an authority site is better than having dozens of links from random and low quality porn forums or blogs.

If you are just starting out and you do not have much money to invest, you can at least make sure that sites that you get backlinks from have a quality content and receive traffic from search engines and are not blacklisted by Google.

Also, do not overly focus on the backlinks, if you are new, because you can still get nice rankings on the Google without a few links or even without any, if you do a good job on other aspects of the SEO that I mentioned.

This is what I can tell you off the top of my head and I could update this topic with more information.