Welcome onboard and first motivation you should have is that, everyone started just as you're staring and there is absolutely  no need to panic.
Secondly it is always better to read more than wanting to make more post in a hurry as over time, reading the writings of others gives more insights to making more productive post.
There is no special rules over here aside plagiarism and you should always give credit to the original ajthor and writer if you're not and try to read all pin threads on the beginners and help board and you should be very good to go.