Your questions are answered in IRS Pub 590-A:
https://www.irs.gov/publications/p590a#en_US_2023_publink1000230981
However, in place of the 2023 limits you'll need to substitute the 2024 limits also mentioned in IRS Pub 590-A:
https://www.irs.gov/publications/p590a#en_US_2023_publink100074297
