When you enter your classroom, take care to remember that everyone in your room comes to you with baggage: hunger, homelessness, poverty, loss of parents or siblings, poor family environment, lack of parental support, and more. Greet them with the knowledge that you may have to overlook questionable behavior an seek a better solution to that child's problems.
Student's not having paper and pencil/pen is never a reason to put them out of your room. Be the grownup and keep a stash just for those children. You may never know why they lack supplies.
Seek to understand the reasons a child may have problems as much as you seek to assist them to learn. Those students will remember you for the rest of their lives!