The old W-4 was confusing, the new W-4 is confusing in a different way. Here's some info that will help you figure it out.
Curious if you should file MFS or MFJ?
How and when do I send estimated quarterly taxes?
When and how to send a 1099-MISC
I haven't gotten my refund yet - why not?
If you aren't able to file your business taxes before the annual deadline, or would prefer to have more time, you must file an extension.
What's the deal with an extension?
If you are not able to pay taxes immediately, don't worry- you have options.