Angel Investors are typically much better investors for a long-term business plan that Venture Capitalists, although they do not come usually with the incredible network to help you succeed. Venture Capitalists are more interested in themselves and making money on their investment then what you get out of it or the future of the business with you in it. An angel investor is interested in you, the future of the business and the possibility of making a whole lot of money on their investment. Please consider all this when presenting your business plan to an Angel Investor.
Overall most people tend to learn better this way rather than trying to learn all Excel formulas at the same time as this can be very confusing. Most of us tend to learn in smaller packages of information and you should look for a course of instruction that will allow you to do this. As you are learning to use Excel you should of course start by learning to use the formulas that you are actually using or are likely to have need of in the immediate future.