Husband makes a lot more than me

FIRSTLY, as a waitress you may or may not have at the end of the year an amount on BOX 8 of your W-2, namely ALLOCATED TIPS which are subject to Federal Income Taxes, Social Security, and Medicare.

SECONDLY, a Married Person can file as either MARRIED FILING JOINTY or MARRIED FILING SEPARATELY.

Per IRS:
"If you are married, you and your spouse can choose to file a joint return. If you file jointly, you both must include all your income, deductions, and credits on that return. You can file a joint return even if one of you had no income or deductions."   You may obtain more information by clicking on the following link:
Married Filing Jointly 

LASTLY, make appropriate adjustments to your W-4 ( you may use a tax calculator) taking into account the taxes you have estimated that you may owe, if applicable. You will need the following:

• Paystubs for all jobs (spouse too)
• Other income info (side jobs, self-employment, investments, etc.)
• Most recent tax return
  
  About Form W-4, Employee's Withholding Certificate 
  Tax Withholding Estimator 
  
  
  
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You should probably  claim Single at work to have more withholding .  What you claim at work doesn't have to match your tax return.   That's only to tell  tell your employer how much to take out.   The more total combined income you make you pay a higher percent for tax.