Congratulations and welcome!
You'll hear people talk about "taking the lane", which is advisable to an extent. You'll learn when to take it and when to get out of the way. If you ride on the right all the time, cars will crowd you. If there is a local bike shop, they might offer a commuting safety class and you can always do a search here to find a plethora of good info.
There are a ton a good sites out there to browse as well.
www.bikeleague.org