If you don't have a T4 slip for your self-employment income, then you don't need to fill in that information.
If you aren't registered to collect GST/HST, then you don't have sales tax in your income, and you haven't used the quick method, so those fields don't apply to you.
If you used part of your home for employment work and self-employment work, you can claim expenses in both sections. You would have to figure out how much of your expense was used for each.
