To "look forward to (doing something)" means to be excited about it. However, this is mostly a polite expression so it doesn't carry a really strong feeling of excitement. It does sound polite, though.
When you've just met someone in a business or formal situation, use the phrase "I look forward to ___ing" near the end of your first conversation. Keep reading to learn other ways to say "I look forward to working with you". For example:
I look forward to working with you.
I look forward to doing business with you.
I look forward to meeting you. (Use this with someone who you've been writing to, but haven't met yet.