The SBA's guide to the two kinds of business plan, traditional and lean startup, with what goes in each section of a traditional plan and example plans.
The US government's plain guide to market research: demand, market size, economic indicators, location, saturation and pricing, plus how to analyse competitors.
The SBA's own statement that it does not provide grants for starting and expanding a business, and where federal grant money actually is: SBIR and STTR research grants, manufacturing grants, and grants to nonprofits and resource partners.
The SBA's page on its microloan program: loans of up to $50,000, averaging about $13,000, made by nonprofit intermediary lenders, generally at 8% to 13% and repayable over up to seven years.
The SBA's page on 7(a), its main loan program, with a maximum of $5 million, the uses it covers and the eligibility factors lenders look at, including credit history.