There are lots of awesome looking mods out there with B9 Aerospace and Mechjeb being some of the most used. I use Mechjeb myself for helping automate launch windows and controlling attitude on more complex rockets. Both of these can be found on Curse (a place that is great for many games that use Steam and even a few that don't). I am starting out with just Mechjeb for awhile so I can get a feel for the vanilla game but I hope to mess around with ever more complex ones as I progress through the game.