I haven't researched the Education accounts specifically; however, you typically need only one agreement per IRA account. You should document each contribution received. You can do that with a contribution form or a contribution receipt. And, of course, you must follow Reg DD rules to properly disclose each investment.
We allow contributions into existing CDs; therefore, once an IRA account is established, we often only have to document the subsequent contributions (unless, of course, they want an additional CD for a better rate).
NEW IRA - custodial agreement, TISA, rollover review (if applicable)
DEPOSIT TO EXISTING IRA - contribution form, rollover review (if applicable)
DEPOSIT TO EXISTING IRA ACCOUNT, NEW CD- contribution form, rollover review (if applicable), TISA
If the Education IRAs are supposed to be treated differently, I would like to know as well.