Finally joined after lurking around for a while

I'm a firefighter in Pittsburgh PA, recently divorced and just bought a house, after my ex got the last one.
I really never did much investing, other than what I have in my Prudential Fund through work (That lost over $1000 this past week)
Did some trading back in late 1999 early 2000 but didn't do so hot. (Lost it all)
I Just put a few thousand $$ into a Scotttrade account today, and this time hoping I can avoid the mistakes I made in the past. (I can be kind if impulsive at times lol)
Right now the money is just sitting, and I'm hoping to learn by reading through these forums and some of the other good internet sites
Hope you don't mind the questions that are sure to follow
Bill