Importing Files in Adobe Premiere
There is a standard process for importing all file types into Adobe Premiere, but it really depends on the format that you are using. If the video already exists as an independent video file such as a .Mov file, then you can do a standard import. Go File in the upper task bar and select Import, which will open up a browser so that you can look through the available storage locations. Here you just select the file that you want and it will give a reference file in Adobe Premiere. This will allow the source file to be used in the program, but nothing will be destructive to that file.
One option is to actually capture footage in Adobe Premiere. What this means is that you want to get the footage from a hard non-digital format, such as a DV tape, and bring it into your program. To do this, the footage has to be recorded to your computer as a digital file. This means that you have to record the tape into your program while at the same time creating an independent movie file of it for the software to reference.
There is a tool for this built right into Adobe Premiere, but it requires that your computer has a capture card and the appropriate type of tape deck. If you have that set up, you need to insert your tape and turn the deck on, otherwise the program will not be able to read it. Then go to File and choose Capture, which will bring up a viewing window where you can essentially control the recording of the footage from the deck. You set the appropriate settings for the footage that you captured and then choose to capture it, allowing the tape to play through. Once it has finished you should have both the footage as a file in your editing project and as an independent video file in your capture scratch.