Here are some further references that I recommend
Why Work with a CPA?
The AICPA recommends CPA's. Find out why.
Where's My Refund
Track the progress of your return here.
IRS Installment Agreement Request
Get a copy of your installment agreement here.
Colorado Electronic Estimated Tax Payments
Department of Revenue's website for estimating your taxes.
IRS Electronic Estimated Tax Payments
Federal tax estimation page.
IRS 2017 Important Dates
Keep up with important dates for 2017.