I believe what I have is a bulk head but it only runs a small distance from the wall. I thought to give the room some character I would cover it with wood so it looks like a wooden beam running across instead but I'm not sure how to secure it or what my next step actuallly is?
There are many different ways you can do this and achieve an attractive look. There are adhesives as well as brads and moldings.
Accessibility Construction Tech
As Mark stated there are a number of ways to tackle this. One is using adhesives as Mark suggested, the other is to ascertain where the framing is with a stud finder. This will map out the framing and allow you brad nail the wood to the frame for a secure fitting.
However, when in doubt you can always remove the drywall, although this may be getting to be a bigger job then you wanted.
I would find the studs or 2x2 cross pieces and then u can nail your wood to them with and 18 gauge air nailer.
Simple way to find the studs is by punching a nail till u find one. After that they should be approx. 16" on center.
If u dont have a nailer u can use a regular finish nail and set it in deeper with a punch then fill the hole with wood filler.
Another way is to use PL700 available at lumber yard.
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