If you don't have enough backers yet, then don't crowdfund yet. You can't afford a very public failure.

If you are doing donation or rewards crowdfunding, make sure you have a tangible consumer product. It's difficult otherwise to crowdfund services, non-tangible or free products.

If you also want to patent, if you have secrets, it's better to make sure your business is secure before going public on a crowdfunding platform. Have a talk to your lawyer about this!