Is it okay to get inspirations from Pinterest or get resources from there?

Do what makes you feel good! You're already asking if it's ok, so it sounds like you'll be respectable of other peoples work. Are you talking about using other people's drawings or a photograph as a reference? I guess context matters.
I used to look through fashion magazines and draw the poses the models made. But there would also be times where I had an idea for a painting and then would ask my roommate to pose for a reference. So, just don't sweat it and have fun.