For ínstalling new tracks there's TSM.
To install new tracks, you can either install a complete trackpack, or install a single tracks manually.
1) Installing trackpacks.
Installing trackpacks is easy. Just click on "tasks" in TSM, and then on "Install track". Then select the .tuh file (the trackpack) you want to install, and TSM automatically installs the trackpack and creates a profile containing all tracks from the trackpack.
2) Installing single tracks manually
First, create a folder for the track you want to install, and put the .wad and the .dat file there. To install the track, launch TSM, and click "manage tracks". Then click "create new track". TSM will ask you know to give the name of the folder of the track. Then enter the information (Name,Year,Coutry,Adjective,Author,Event). Not all of this information is required for the track to work, but you should at least enter the track name and the country, so you can later find it easier. Then you enter the .wad and the .dat file of your track and click "save".
3) Creating your own profile
To create your own profiles, click "manage profiles". Now you can edit and create profiles. To create a new one, click "create new profile". Now select the tracks you want to use from the list below, where all your installed tracks show up (the ones from Trackpacks and also the manually installed ones). When you're finished, quit TSM. Now go to the mods configurables, and select the profile you created to play the tracks you installed.
I hope that helps.