The best first step is to speak to the child's parents and get their input...then check out the supply and prices where you usually shop. The preparation does not require any special utensils, but you should avoid all pork products. If the parents and you can work out a happy compromise, all will be well. If, on the other hand, you feel uncomfortable, or the prices of halal are much higher in your neighbourhood, you may have to ask them to bring his meat dishes, or let him go. But, I think you will find that this quickly becomes a non-issue, and your and your new family will get along just fine.