Always a good read if you are an entrepreneur. You need to register for a free account.
Type in business plan into a search engine and you will find a ton of websites to choose from. You can start with this link and then look at other sites and within a few hours you will know what to do.
This article calls these killer business lessons. There are 23 lessons listed.
I have not used this site in years but I know it's super popular with Internet entrepreneurs and webmasters. The site calls itself a marketing forum & marketplace
So much of the opportunity available today is via the Internet. Talk to other Internet entrepreneurs and/or webmasters here.
SBA run by the United States government. Guarantees loans granted by banks, microloans and so forth.