http://www.irs.gov/taxtopics/tc511.html - business travel expenses
http://www.irs.gov/taxtopics/tc305.html - record keeping
http://www.irs.gov/publications/p552/ - what records to keep
http://www.irs.gov/publications/p463/ - more detailed on record keeping
http://www.irs.gov/publications/p535/ - business expenses
http://www.irs.gov/publications/p529/ miscellaneous deductions
http://www.irs.gov/publications/ - list of all IRS publications

http://www.finweb.com/taxes/reporting-royalties-in-your-federal-income-tax-schedule.html
http://www.ssa.gov/pubs/10022.html - self employment (SSA)
http://midnightwriters.blogspot.com/2010/03/tax-tips-for-writers-by-jess-lourey.html

This whole writing biz is way complicated.