Omochi kaeri is the word.
As you order, it is appropriate to ask if they do"omochi kaeri"(take out ). For examples, "Omochi Kaeri Deki math ka?"( Can you do take out meal ? ) . Then start order foods like "sushi set, kudasai." it is appropriate to memories your address or phone number in Japanese, too. FYR: theres no tipping system exists in over here and most likely tipping may causes confusion unless they have knowledge in such.