W-4 help. Married, one earner with three jobs.

Hi personal finance, My husband and I recently got married and we're having some trouble filling out the W-4 for his employers. My husband has 1 full time job and 2 part-time jobs and I currently don't work. He earns a few thousands from his part time job and about 50,000 total before taxes from all jobs. Our questions are :

1. How many exemptions should he claim on each W-4(full time and part-time w4)?
2. Should he choose the married tax rate or married but withhold at single higher rate for each of the 3 jobs?
3. Should he claim himself as an exemption on all 3 W-4s or can he only claim himself on 1 W-4?
4. Should he claim his spouse (me) as an exemption on all 3 W-4s, or can he only claim me on his full time job W-4?

We don't want to end up owing the IRS but would like a little extra money with each paycheck. We appropriate your response. Thanks for your help