Research conservative manifestos, too. Goldwaters "Conscience" or Milton Friedmans "Capitalism and Freedom" are good examples. You dont have to like them if you just want examples of a manifesto.

Also: I'm not trying to troll, but dont write a manifesto. If you're on this website I can safely assume that you're under 40. therefore, your political views are going to change about every 6 months. To write a really good manifesto, it usually takes at least a year. This is not to say that your ideology will change, but the specifics of your views will.