Difficulty with Outbound Route and Trunks

Hi Everyone,

I’ve installed the latest version of AsteriskNOW, I’ve gotten past the point where I can call internally between extensions. I’ve got a TDM400P installed and I’ve got two analogue lines I’d like to use. It’s been years as an on-and-off project I’ve been trying. What I cannot seem to wrap my head around is:

The system sees the TDM400, what I’m unsure of, is adding the trunk, how do I do that? Then the next thing is the outbound dialplan, how can I configure in the GUI a simple way to allow outbound calls through a particular line?

I’m aware that these questions have been asked many times before and some of you may tell me to search, but please share some light on my situation.

Thank you in advance.