Sentence examples for what I will from inspiring English sources

The phrase "what I will" is correct and usable in written English
It is often used in sentences as a noun clause to introduce a subordinate clause, serving as the object of a verb or preposition. For example: - "I am not sure what I will do tomorrow." (noun clause serving as the object of the verb "do") - "Do you know what I will say at the meeting?" (noun clause serving as the object of the verb "say") - "I have no idea what I will need for the trip." (noun clause serving as the object of the verb "need") - "It all depends on what I will find at the store." (noun clause serving as the object of the preposition "on")