Having and ELL student in your classroom can be make you nervous and uncertain about your abilities to meet their needs. I know how you might be feeling, I have been there as well. A few things to remember is that they might be as nervous or even more nervous then you are. The best strategy to having in this situation is to know that you are 100% capable to handle the situation. If you can build a sense of confidence in yourself, it will be contagious to the students. As a teacher you should be aware a some of the emotional and educational struggles that the students will experience. Many of the students will go through what is known as an acculturation period. If you are unaware of what this means, it is a 4 stage integration process where the student's cognitive and emotional abilities will fluctuate as they settle into this new community (both in the classroom and outside of school). I have prepared a short 'book' that outlines this acculturation process as well as some strategies to help this new student feel comfortable in your classroom.
Another thing that as an educator we have to be aware of for students who come from a different culture is that fact that their native culture is very important. We should celebrate their culture and help them develop into a bicultural student. This means that they will develop a hybrid between their native culture and their received culture. To the student they might look 'Canadian' when hanging out with peers with a similar 'heritage' culture, but may look 'foreign' when hanging out with their 'Canadian' friends. It might also come out as them having say Asian vegetables with their cheese burger. Ultimately we want our students to identify highly with both their heritage culture and received culture. I mention this because the culture of the ELL helps identify who they are as an individual and we would never want our students to loose a clear vision on who they are as a person. The table below helps indicate this balance between 'heritage' culture and 'received' culture.
Another way to help students both you and the students build confidence in your classroom is to identify everyone's language learning strategies. If you have not ever completed a strategy inventory for learning (SILL), I would highly recommend completing one (there are many version of it online or try this one: SILL Assessment and SILL Assessment KEY)
By identifying the language learning strategies for everyone (both teacher and students) you will be able better prepared to structure activities and lessons to facilitate the best possible learning. When students see themselves learning they will gain more confidence (and so will you!). It will be hard at first to adjust your teaching practices, since you will most likely want to teach to your strongest strategy, but simply try new things and see how it goes. Maybe you will even learn something new about yourself in the process :D.