Can some one help me with some prelander examples for sweepstakes ?

I am doing fb ads from some time and I really do not have any experience with prelanders , I just use the one from my network and the prealanders are not converting . I would really appreciate if some one can give a hand of help (I can help back if possible with anything I can).

Have a look at your sweepstake competitors at Facebook Ads, visit their landing pages, combine their methods. If they wouldn't have success, they wouldn't advertise on the long run.