Forms:
1040 Tax Form: http://www.irs.gov/pub/irs-pdf/f1040.pdf
Tax Table: http://www.irs.gov/pub/irs-pdf/i1040tt.pdf
W-4: http://www.irs.gov/pub/irs-pdf/fw4.pdf
W-9: http://www.irs.gov/pub/irs-pdf/fw9.pdf
Links:
IRS Website: http://www.irs.gov
Unemployment Tax:
Texas Workforce Commission Website
http://www.twc.state.tx.us/customers/bemp/unemployment-tax.html
Sales Tax:
Texas Comptroller Website
http://www.window.state.tx.us/