Take the time to observe, listen and get a sense of the culture but not too much time - give yourself 90 days. Read the Harvard Press book my first 90 days so you can develop an effective plan and hit the ground running and get some quick wins under your belt. Find a mentor or two - build a peer network of go to women you can count on. Invest in people and build a strong network and learn how to collaborate well with others while driving results.
I worked here for 8 years and wish I hadn't stressed so much about my maternity leave. My team was fully supportive through this tough personal period, and I was still respected for my work ethic and performance.
You can't do it all, particularly after you have children. Decide what is important to you, and stick to that - and try to be consistent, it is helpful to those you work with, and to your children. Work with your manager to find the right balance that works for you - it takes open communication and honesty but has worked for me for many years!
Be confident in yourself, and others will be confident about you. Be a decision maker, people are hungry for direction. Be kind, smart and nice aren't mutually exclusive. Don't get hung up on levels and promotions, instead do good work, elevate others and success will come. Or at least you'll be happy. And be clear about what you want from your career. Don't assume management will guess at your aspirations.