Final answer:
The sentence should be punctuated with no additional punctuation: 'My father told us to go to the store immediately and get some milk.' Quotation marks are unnecessary, and commas are used as per the guidelines for separating list items and after introductory clauses.
Step-by-step explanation:
The best way to punctuate the sentence “My father told us to go to the store immediately and get some milk” is without additional punctuation: “My father told us to go to the store immediately and get some milk.” Quotation marks are not needed because the sentence is not directly quoting someone's speech; it is a reported instruction. When writing direct dialogue, use quotation marks to enclose what the speaker exactly said, as in: “Put me anywhere you like,” he said.
Commas are used to separate elements in a list, set off introductory elements, and join independent clauses with a coordinating conjunction. For example, in the sentence “Though Susan wasn't feeling well, she went to the store anyway and bought ice cream, pizza, and candy,” a comma is placed after the introductory clause and used to separate the items in a list.