Have a question, and I appologize in advance for it ;)

Hey all!I am looking for a step by step tutorial for creating my own mesh scenery for different areas. I did it long ago one time for the Nashville area, but I do not remember what program(s) I used.So, if there is one, I would love for someone to point out a step by step tutorial for someone that does not know all of the lingo. I am very familiar with the FS2002 file structure and what not, just not sure where to get the best data & how to go about converting it from website download form to a *.bgl file.Thank you in advance!