This is for first grade middle school students? You could ask your school to buy you some Level 3 Dolphin Readers. They have green covers. Don't go below level 3 because below that it is appropriate for elementary school students in Korea, but not for middle school. Level 4 is good for more advanced students. I don't know your students' exact levels, but I would start with level 3. You can buy them on gmarket or take a look at them if you can find an English book store in your area. There is also this book called "Easy True Stories" by Sandra Heyer. That is also a nice book with activities in it. The Dolphin readers have tons of activities in them as well. The Sandra Heyer book you might have to buy in a bookstore. For some reason it is hard to order in Korea even though that book has had newer editions made of it. It's a jewel. I prefer Dolphin Readers though. I just find them to be more level appropriate. Good luck! I hope it works out!