How can i do SEO on a new Videochat Website? (Without to pay for some tools)

Hello everybody , i have a new videochat website , i have banners from crakrevenue and the video is not live , is only a preview then you must to register to continue the live stream , when you register you register on crakrevenue . I publiced the website on facebook on 25 facebook accounts with 5k friends eatch , and i have around 300 visits/day , but also i want to do SEO , i put all my money on this website and i dont have money to pay SEO services or SEO tools . So if anybody have some ideas how to do SEO please share with me the ideea . Thank you .