You firm name/address/EIN will appear on the return. Are these other preparers your employees? Are you going to be reviewing these returns prior to Efiling? You may want to check with your E&O Insurance carrier to see if you're still covered if these other preparers are not your employee.
Yes you may file returns you do not prepare, but you must put the preparers PTIN. This is from pub 1345:
An ERO that chooses to originate returns that it has not prepared, but only collected, becomes a tax return
preparer of the returns when, as a result of entering the data, it discovers errors that require substantive
changes and then makes the changes. A non-substantive change is a correction limited to a transposition
error, misplaced entry, spelling error or arithmetic correction. The IRS considers all other changes
substantive, and the ERO becomes a tax return preparer. As such, the ERO may be required to sign the
tax return as a tax return preparer.
Here is a link to pub 1345 that you should read
An important client wants to have his bookkeeper handle tax returns that his clients ask him about. They would do the simple returns, I would get what they cannot handle. They are just starting out in the preparation business and the EFIN application process will take longer than the tax season. They will have an EFIN for next tax season.