These are all excellent ideas.
My suggestion is to do the following:
1) Research and Planning
a) First decide what business you really want to start.
b) Figure out how big the opportunity is and do some solid research and planning. The more realistic and focused you are, the more interested any potential investor will be.
c) Figure out how much money you really need to start the business.
Depending on the business, step 1 could take anywhere from a few weeks to a few months. But you can start talking to investors before you are finished.
2) If your business has any proprietary secrets, talk to an attorney to protect yourself against idea theft. This is especially important with businesses that have cutting edge technology or processes.
3) Start networking. You probably have a much bigger personal network than you think. Tell people about your idea and tell them you are looking for capital. For each person you talk to, ask them if they know someone else you can talk to.
4) Simultaneously pursue other funding options (including those listed by others above).
If you have a solid business idea and keep working at getting the money, you should eventually succeed.
Good luck with the business!