Thanks so much for your email, [first name].
I’ll get started on this [this week / as soon as the new product launches / after the conference].
In the interest of getting back to you promptly, could you help me prioritize the list below?
Are any of the items nice-to-have? I expect it will take me [X days/hours] to pull this together, which may delay [other project].
Let me know if you’d like me to get started sooner.