Standard ball bearing servos such as Futaba S3004's will be fine for this as well as probably your next plane.

Nitro Models plane's instruction tend to be lacking for someone that has never assembled an ARF before so you may want to seek help in putting it together. Also a lot of time numbers get mixxed up in the translation/conversion process so the center of gravity can be just plain wrong in the instructions. Without any experience you would have no way of knowing if it was close and this alone can lead to a crashed plane. Just looking at the pictures and specs on the web site would keep me from buying this plane though. It's advertised weight is 5 lbs (the standard weight for a .40-.46 trainer is 4.5 to to 6.5lbs) so if the weight is advertised accurately this trainer will hover with a .60 on it. It has a 70in wing span which is equal to the larger .46 powered trainers. I also don't care for the wood plank style engine mount that is common in older designs but that is just a personal prefference. While I wish you the best of luck with this plane I would also highly encourage you to look into a Tower Hobbies Trainer 40 for $10-$15 less.