In the beginning you should be bootstrapping the business off your own money or maybe from FFF (friends, family or fools) This should get you as far through the idea stage and finding a founder or two to help you get started. Normally once you get to the point where you need to build a prototype, or hopefully just afterwards, you’ll need a round of funding to give you a boost. This is where you go look for angel^ funding.
This ‘first’ round of funding is generally called your seed funding. The purpose of this funding is to setup the business (get office space, register, apply for patents, etc) and to get you to the next milestone or further. Try not to spend all this money at once as there are bound to be many unforeseen speed bumps and delays along the way and time is one of the most valuable things to a startup.