There are a number of ways to accomplish what I think you are trying to accomplish. Which one is easiest for you, or the best method to use, really depends on your long term goals. Once the learning curve is behind you, this will all become clearer.
For now, probably the simplest method to start with, for a single album, is to add track numbers manually into the [track #] field. Then, when things look correct, rename your files according to your personal naming scheme, using the tool I mentioned earlier.
The MC internal database contains the track meta-information, so you can rename the files w/out concern. If the renamed files are not as you desire, just rename them again.
Keep in mind - the data MC shows in the views, the meta data in the tags, and the names of audio files are *independent*. The MC tools available allow you to coordinate this data to your personal needs.