This question is not really about PSRchive but about shell configuration. However, for your convenience, here are some pointers:
The environment variables that need to be setup in Bash shell (and any other shell) are the exact same variables that need to be setup in C-shell.
You can find a very good documentation of the bash shell here:
In particular this section is relevant to you:
In general, the setup of variables is nearly the same as in C-shell, you just need to replace all environment variable calls of the form:
setenv VARIABLE value
with the Bash equivalent:
Hope this helps,