First of all, congrats on getting past your phone interview. Phone interiews are very difficult since you can not "read" the body language of the interviewer.
I think you have some great ideas for your sample lesson though I would have to say that a 15 minute lesson is VERY short. We have our candidates do full sample lessons, in fact, we are on a block schedule so they each had to teach an 80 minute block on a topic that fits with the unit the students were already studying.
I think you are doing the right thing by doing a lesson that integrates social studies and language arts. In fact, I tell all teachers applying for either language arts positions or social studies positions that their lessons should be integrated.
As for displaying a set of classroom rules to show how you deal with behavior management...I would be careful with this. If the sample lesson is only 15 minutes, establishing rules may go off on a tangent that could wind up taking more time than you think. Instead I would address classroom management by keeping your students actively involved in the lesson. It seems that your lesson does that already, but you could throw in a couple of "pair/shares" to help keep students involved. Also, from my experience, with other teachers in the room observing you the students are usually well behaved.
Also, I would make sure to let the students know the objective of lesson from the very begining. For example, "By the end of this lesson you will be able to explain the difference between primary and secondary sources AND be able to provide several examples of each.
Also,I am not sure if it is necessary to "pretend" you are starting a project and have the students line up for the computer room etc....this may actually confuse some of your kids. (Just my opinion). Instead, I would make sure to have some type of closure that shows the students met the objective. For example...you could have the students all write down examples of primary and secondary sources that were not used in class. You could then have the students pair & share what they came up with etc.
Closure is very important. If you are given the opportunity for a post-observation, you can then say that your objective was clear and that based on your closure activity you were able to determine that all the students met the objective.
I hope you understand that these are just my opinions. If you are interested, you could also try doing a "pattern search" to get the students to come up with their own definitions of the two terms. A "pattern search" is a constructivist method that works great, but takes a little practice. If you are interested let me know and I can try to help.
As for the types of questions you will be asked, just remember to answer them with specifc examples from actual lessons. I strongly suggest my ebook "Your Basic Guide to Acing Any Teacher Interview". You can purchase it here on Amanda's site: http://store.atozteacherstuff.com/do...rviewtips.html
There is a list 25 potential questions you will likely be asked and suggestions on how to answer them.
Hope this helps...don't hesitate to contact me if you have more questions.