There are several questions I wish to explore the answers to, such as, is the use of second language English the same as first language English? Or are there differences due to the influences of the other language?
If I have a quibble, it is that these questions are in one sense too big (you can’t draw such general conclusions from two individuals) and – perhaps paradoxically – lacking in ambition (it’s pretty obvious that there will be differences, so what are you hoping to achieve?).
Try and formulate your research question(s) to focus on your particular small-scale investigation, placing it within the context of what you have learned from larger scale findings about bi/multi lingualism from your reading.
Even though most of you are dealing with very different topics, the idea of including in your introduction the specific research questions that your investigation sets out to answer, and placing these within the wider context of research in that area of language study, is a sound principle that can apply to everyone.