I am building a new warehouse for my business and have a lot of expenses related to the building of the warehouse in 2024. Where do I enter that cost on the schedule C?

You will not enter the building costs as you incur them.  The building will be an asset, so when the asset is put into  use, you will enter all the costs of building the building and then depreciate it over its useful life.  For a commercial building, the useful life is 39 years.