I'm not a CPA or a tax professional, so please don't PM me with tax-related questions. That said, I'm posting some IRS publications that relate to traders specifically. They may help answer the questions regarding trader status, mark-to-market election, and income and expense reporting. These links are good places to start:
Topic 429 - Traders in Securities (Information for Form 1040 Filers)
http://www.irs.gov/taxtopics/page/0,,id=105556,00.html
IRS Day Trader FAQ (note the IRS can't even spell correctly)
http://www.irs.gov/faqs/page/0,,id=15846,00.html

Topic 429 - Traders in Securities (Information for Form 1040 Filers)
http://www.irs.gov/taxtopics/page/0,,id=105556,00.html
IRS Day Trader FAQ (note the IRS can't even spell correctly)
http://www.irs.gov/faqs/page/0,,id=15846,00.html