New Calling

So I had this feeling that I was going to be called as the CTR 8 Teacher, when the Primary Presidency called last week and asked if I could substitute until a new teacher was called. When we were asked to meet with the Branch Pres last Sunday, I knew for sure it was happening. I am so embarrassed to admit this, and I will blame most of it on my pregnancy hormones, but I cried when he called me. I converted to the Church when I was 21 and have never even attend primary, let alone know anything about it. I didn't want to say no to the calling or anything, and I totally accepted the calling without hesitation, however, I was sick to my stomach with nerves and uncertainty.
After attending last Sunday's classes, I feel a little more comfortable with the idea, but I am still really nervous about the whole thing. How do I keep 5 boys interested and engaged in my lesson for an hour? The manual is very helpful, but at the same time, some of the lesson ideas just won't work in our group setting. Anyone have any good websites or ideas on lesson planning? Or just words of wisdom in general?
I haven't held a calling in over a year and I know that is part of why I am so nervous. Ever since Matt graduated and we left Logan, we have been floating from home to home and ward to ward. Now that we are finally settled down for longer than 3 months, and our records are finally in our home ward (or branch in our situation), of course, I am going to get a calling. I know I'm not alone when it comes to getting nervous about a new calling. But I can't help and think that every Sunday these boys' parents are going to ask them after church "what did you learn in primary?" and it is up to me to make sure that they can answer that question. As I type this, though, it doesn't seem like it is that hard of a question to answer or a task for me to deliver. They are basic gospel principles and I know that I will honestly learn a lot from these kiddos and the lessons. I can do this!!! Right?!?! :)