How many credits do I need to be a senior? What should I do when I reach senior standing?

You are a senior when you reach 88 total credits (including MSU and transfer credits).  When you reach senior standing, you should schedule an appointment with your academic advisor to make sure you're on track for graduation. 
You should also be sure to see the Career Services and Placement coordinator for engineering - Ms. Jennifer Jennings in The Center, room 1340 Engineering Building - to get resume preparation information and to get started on your career search.