If you are a system administrator or have a root access, you probably want to put them in some centralized place. Cronyx's set has a very self-explanatory Makefile . Browse through it. The general idea is that you need to run bdftopcf on each bdf-file. You might want to compress the .pcf output, for X servers understand that.
Some X servers like to have a FULL path.
You may want to tell xset q to the server. You can now use your fonts in any application through the usual X mechanism. X servers support scalable fonts, specifically Type 1. True Type are also supported. First of all, Sun's server supports Type 1 fonts only in the .pfa format.