First, define what constitutes "success" in this team. This may depend on a combination of the goals of the team members, the leaders (your leaders), the company, and yourself. You won't figure this out on the first day or the first week as it will take some time to understand the context and rationale for different stakeholders' goals. After you get a good sense, ask yourself if your team is sailing in the direction of these goals. Calibrate accordingly and don't change what isn't broken. Fight the urge to revert to tools/techniques/mindsets from previous teams that you might be more familiar with. If things need to be changed, be VERY sure to have a good reason for it or you will lose the respect of your team early on. Good luck.