The first thing to do is find an immigrant family that you want to interview and that wants to be interviewed. It is better to interview a family than an individual. Not only will you get more viewpoints, but you will see the different effects America has on different generations.
You can start by looking around your classroom and school. You probably have immigrant friends or classmates. If not, try your community. Do have any immigrant neighbors? Are there immigrant businesspersons in your community? Talk to them. Tell them what you doing and why you want to talk with them and their families.
Once you have found a subject, it's time to do the interviews. You can take notes or record your interviews on tape. (Remember, when taping it's useful to take notes too, that way, you have a rough guide to what's on the tape.) Maybe, you want to take pictures of the subjects in their American home doing American things and doing things from their native country.
Before getting into the bigger questions, get the basic information about each member of the family: name, age, sex, native country, native language, occupation (if working), and how long they have been in America.
Now, it's time to get into questions about how America has changed them. What are some of the first American things they did? What are some of the old ways of life they gave up? When interviewing the children, ask them if there are American things they do that upset their parents. When interviewing the parents, ask them what American things their children do that upset them.
Once you have collected your interviews--and taken pictures--it's time to present your material. For some ideas on that, go to Step 3A.