You should be able to find a decent one lens monorail kit for under $500. Sinar F, Toyo, and Calumet are regularly found in that price range, but usually not much lower since decent 130mm - 180mm "normal" lenses are seldom less than $200 by themselves. Be aware that you will be needing film holders. I would consider six to be a reasonable number allowing 12 exposures before you have to head to either the darkroom or the changing bag.
Regarding the tripod...think something like the old standby Bogen 3021. The tripod should be tall enough so that you will be able to view the ground glass without stooping (it gets old fast, believe me). It should also be sturdy enough to support a load of six to eight pounds. Provision to hang weight from the center column is helpful. Believe it or not, but a 3-way tilt/pan head is preferable to a ball head. Part of the view camera flow is leveling the camera in both vertical and horizontal planes. This is NOT easy to do with most ball heads.
Oh, for your convenience, here is the URL for the Large Format Web site and forum:
http://www.largeformatphotography.info/
The link to the forum is towards the top of the page.
Steve