It is generally better to file jointly when you are married. You can, however, fill your W-4s out and select to have withholding done at the higher single/married filing separately rate. This may be best with the "unknown" element involved in your husband's earnings.
If you have a pretty solid estimate of what his earnings may be based on past experience or other factors, you can try this withholding calculator.
The main consideration is: Do you like to let the government hold your money all year and get a larger refund, or do you prefer to keep your money in your bank and get a small refund or maybe owe just a small amount?
It may not be possible for you to complete the worksheet in step 2(b) of the W-4 for multiple jobs to get the amount to enter in step 4(c) for extra withholding to avoid a tax bill at the end of the year, without knowing your husband's earnings. At the very least check the box in step 2(c).
Hope this helps!
Cindy
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