Congratulations!
If you can file jointly all income and expenses for your home including the mortgage interest and real estate taxes would be on the one return.
If not and you are 50/50 owners of your home you may each claim 50% (or any other percentage) of interest and taxes. Since your partner makes more than you, it may make more sense for her to claim all of the expenses to get the bigger tax savings. There are no special considerations regarding paying real estate taxes for the first time that I am aware of.
The following will provide some additional information:
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-credits-deductions/deduct-mortgage-i...
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