Newbie seeks advice on digital camera kit going from novice to pro

I have read a number of the posts on camera recommendations but technology changes so quickly so I wanted to see what people are saying about any new gear out there, hence the post.

I've always done photography as a side thing but people really like my work, so I want to take this hobby more seriously. Here's where I need your help and expertise. Most of my stuff is run and gun, nature, still life etc. so mostly outdoors. Although I do take some indoor event pics. Thinking of getting a digital SLR camera, I've been using a digital point & shoot so far with good results but want a more pro level camera because friends are starting to ask me to shoot events, parties, weddings. Any reccos? Also what equipment besides the camera would you pros recommend a newbie going pro invest in? Lights? Tripod? What printer would you recommend for a beginner? How much of a financial investment will this be? How low can I go and still be pro?

Thanks in advance.
Zed