I am gonna make a website. Soo.. I need some tips.. :}
My first suggestion is to brush up on Internet and Social Media laws. You can't have a site that is open to ALL ages in social media. Federal Law prevents anyone under the age of 13 from being allowed on these sites which is is why accounts get banned on these types of sites without special things being done (and no one does them because it isn't feasible to do so) if they find out a user is under 13. (and if you don't comply with the laws there are huge fines, and they will shut you down.)
Do you intend to open it to the world like Facebook? Or are you thinking of a smaller site for family, friends, etc?