It's okay, I'm fairly new here also. I would say that as long as you are actually trying to do the work, follow the guidelines, and follow through with the people who reply to your question (showing that you understand and thanking them) you don't need to worry much about posting too much.
I would also recommend that you try to use any other resources you can find (such as textbook or physics websites) in an attempt to figure the questions out on your own. You should also look through other posts to see if there is anything you can help answer, and search to see if other people have had similar problems. Especially if your teacher is grading for accuracy, and just to make sure you understand how to do the problem correctly, you can always do as I have occasionally done (ex
https://www.physicsforums.com/threads/swimmer-off-tower-velocity-and-force.928071/ ) and post the question with all of your work and answers to see if you got the correct answer.
Hope this eases your worrying.