New to this, How expensive is this hobby?

[Acadieman]

I'll let others chime in, but from what I gather some people have built bruder conversions from roughly $800 and up. The sky is the limit for how much you want to spend.

There are kits for every level, some come as parts, others pre assembled.
Its best to look at some of the post and to follow for a while to determine what you want.