Three important things to note before you start:
Firstly, don't think of SIL project as a piece of homework. Doing an SIL project is actually a chance for you to learn about anything under the sun that you are curious about! You learn because you are curious. There is no test or WA or exam associated with SIL projects!
Secondly, your SIL project need not take many weeks. It can be a short project.
Thirdly, you do not need to do your SIL project alone. You can do it with your friend(s) from any class and any level. Of course, if you want, you can also do it alone. The choice is yours!
Click on drop down menu of Getting Started for more information.
Alternatively, you can click here: Step 1 | Step 2 | Suggested Timeline