A website plan is a kind of reverse engineering. Start with your goals first, working out what the final result should be. You may be looking for sales online, enquiries from interested visitors, likes and shares on your social platforms, for people to download a brochure, or even sign an e-document, or you might want to promote a holiday home. Build up a wireframe structure that is designed according to those goals and work your way back to the home page so that nothing is left undone from the end to beginning.