Chances are your older employees have seen it all. They will be able to tell you what's a potential problem and what isn't. If you're asked to solve a problem, go to them for advice before you try to come up with anything on your own. New managers frequently want to come in and totally redesign processes and systems to show how smart they are. There may be some tweaking necessary but for the first few months, I encourage you to keep things the way they are.
Chances are the systems and processes have a history and have good reasons for being in place.
If there are major areas you could change right away, you'll still look like a more thoughtful manager if you ask for advice and get input from others, then propose a change in a reasonable timeframe. Employees respect a manager who tells them what they did wrong without laying blame you'll go far with your employees if you admit a mistake you made before you talk to them about mistakes they've made. Employees also look for a leader who knows when to pass on important company information, when to go to the next level with a concern, and when to crack down on the rumor mill. Remember, your job is to facilitate the work of your employees. Communication is the best way to do that.