If the editor is opening then you should be able to compile and run your code. I don't believe there's any other set up to do.
Have you tried running any examples? If not copy and paste the code below and try running it to see if it works (press F5 to compile and run). If it does then DBPro has installed correctly.
repeat
text 1,1,"Hello world"
text 1,20,"press left mouse button to quit"
sync
until mouseclick() = 1
As for your scripting errors, if you post the code that produced the errors then maybe someone can help you with that.