I need to print different lines in different font types and sizes to the terminal window from csh script. I can easily change font color and print characters in bold or underline, but cannot figure out a way to change font. Any help is greatly appreciated.

I am intrested to know how you change colour and change it bold ..or underline ??

To change the color from the script or the command line, you execute command in the following format: echo "<esc>[<color>m <string>", where
<esc> is an escape character (Ctrl+V), followed by a bracket [, followed by a color code (see below), followed by letter m, followed by a string to print. Color codes for foreground are as follows: 30 (black), 31 (red), 32 (green), 33 (yellow), 34 (blue), 35 (magenta), 36 (cyan), and 37 (gray). For backgrounds color codes are the same, except instead of 3, they start with 4. They can be mixed and matched. Bold is 1, underlined is 4. For csh shell, I actually had to use vi editor and enter Ctrl+V to have that character recorded, bracket follows right after, letter m is necessary after the color code to end the escape sequence. In other shells, \033 or \E can work instead of using Ctrl+V. Here is a complete example:
echo "<esc>[34m I am in blue" or echo "<esc>[1m I am in bold". I hope this helps.

Actually you should read about ANSI colors.
To make a bold/standout/invert/underline/blink/... text you could use 'tput'.
The terminals could support different number of colors (I use PuTTY with 256 colors support). Support for bold/standout/blink/etc. depends on the terminal capabilities as well.
This is possible to switch to "alternative font". You should google for the characters sequence.
This is possible as well to display "upper half" and "lower half" of a letter (so you could get characters that are 2x larger).
All the time remember that it require terminal caps and you should not use it when you don't have that caps supported.
As for the colors: If the terminal can handle 16 colors then you should be able to use: <ESC>[XX;YY;ZZm sequence (<ESC> is \033 is 27 is \e and it is the escape character/sequence). Correct numbers could tell to use some color/caps. Ex. \033[48;5;187m is (possibly I mixed up this one blue color bolded text on gray-yellow background on 256-colors terminal.
Some examples:
Forecolor Red: \033[31m
Forecolor Blue: \033[34m
Backcolor Yellow: \033[43m
Blink: $(tput blink)