No.
A spouse can never be claimed as a dependent. File a joint return.
Married Filing Jointly is usually better, even if one spouse had little or no income. When you file a joint return, you and your spouse will get the married filing jointly standard deduction of $25,900 (+$1400 for each spouse 65 or older) You are eligible for more credits including education credits, earned income credit, child and dependent care credit, and a larger income limit to receive the child tax credit.
No. You just file a Joint return for the both of you even if one spouse has no income. You get a higher Standard Deduction. Joint is better than filing Single or Separately.