My SEO strategy is to post as much unique content as you can. Obviously not all video titles have to be hand written, but most of them should so in my opinion it is better to have 100 original titles than 1000 copied ones. If you are starting out your tube, then take it easy, even if you add hundreds of posts in a week or a month, Google treats new sites differently because there are thousands of new blogs and tubes created every single day and it will take time to tell which sites are really of a good quality and deserve to be ranked high in search results.
You can ad anytime you want, but one thing you have to keep in mind that you do not want to annoy your visitors by plastering your tube with lots of banners.
If you are buying any links, make sure that they are from great sites and it is all about quality over quantity so again it is better to have two good backlinks than hundreds of them from spammy sites.
Also, if you open a tube then make sure to choose a niche like foot fetish, ebony or something else because it is very hard these days to compete against giants like PornHub. Even, I would say impossible for most of the new affiliates just beginning their journeys online.
How to monetize your adult traffic? If you have the niche then cams are doing quite well. You could start promoting sites from AWEmpire (LiveJasmin being the most popular one) and even create your own white label that will be similar to your domine name. A good example is what PornHub has done for their network, their white label name is PornHubLive.com. I hope you get the idea.