I am a very beginner of ArcGIS. I got this CD of GIS files of a city and intend to work on watershed management.

There are different file names in different formats on CD. Like .shp, .shx, .dbf, .sbx. and I have no idea which one to choose to start working on.

As there is a file named contour line (in all mentioned formats) I would guess I need to start with that one. I am not sure, though. I also found out that I should use Spatial Analyst Extension. But in which step? Do not know.

My question: Please tell me the main steps of the mentioned question. Which file to start with to end up with a 3D file of watershed and its boundaries and main steps. I will find the details myself. I really appreciate your consideration and replies.

I am an ArcGIS beginner. 

I have a CD of GIS files of a city and intend to work on watershed management.

There are different file names in different formats on CD. Like .shp, .shx, .dbf, .sbx. and I have no idea which one to choose to start working on.

As there is a file named contour line (in all mentioned formats) I would guess I need to start with that one. I am not sure, though. I also found out that I should use Spatial Analyst Extension but in which step I do not know.

What are the main steps, and which file to start with to end up with a 3D file of watershed and its boundaries?

I am a very beginner of ArcGIS. I got this CD of GIS files of a city and intend to work on watershed management. There are different file names in different formats on CD. Like .shp, .shx, .dbf, .sbx. and I have no idea which one to choose to start working on. As there is a file named contour line (in all mentioned formats) I guess I need to start with that one. No sure, though. I also found out that I should use Spatial Analyst Extension. But in which step? Do not know. My question: Please tell me the main steps of the mentioned question. Which file to start with to end up with a 3D file of watershed and its boundaries and main steps. I will find the details myself. I really appreciate your consideration and replies.

I am a very beginner of ArcGIS. I got this CD of GIS files of a city and intend to work on watershed management. 

There are different file names in different formats on CD. Like .shp, .shx, .dbf, .sbx. and I have no idea which one to choose to start working on.

As there is a file named contour line (in all mentioned formats) I would guess I need to start with that one. I am not sure, though. I also found out that I should use Spatial Analyst Extension. But in which step? Do not know.

My question: Please tell me the main steps of the mentioned question. Which file to start with to end up with a 3D file of watershed and its boundaries and main steps. I will find the details myself. I really appreciate your consideration and replies.