Indoor shooting, black or white background No flashgun. No accessories. I have a very large room with high ceilings. 18 ft x 18 ft room ceiling about 9 feet or moor high. For a brochure & other general use.
So from this I am assuming that you are looking for guidance about what lighting to purchase to take your portraits.
If you are going to be using the lighting specifically in the environment as suggested above my suggestion would be to purchase some Studio Flash Heads, a decent sized softbox and a couple of brollies. This would give you some versatility, although the quality of the equipment will depend somewhat on how much money you wish to spend.
You could purchase a couple of cheap Chinese studio flash heads with a softbox, brollies and stands from ebay from about £160 or so (I have a couple of these that I use as occasional fill-ins or bg lights) , but personally I would probably suggest a 2 or 3 head outfit from a major manufacturer such as Bowens or Elincrom (I have 3 Elinchrom 400BX heads) but this will set you back in the region of £500+. There are some cheaper outfits on the market from both these suppliers and others but I do not have any experience of them.
Personally I would not use continuos lighting unless cost is a major isssue, it can be uncomfortable for a model when on for any length of time (heat build up), can be difficult to colour balance with ambient light (if you ever decide you need to).
What you should budget for though is a reasonable Flash Meter and I would suggest that you look for one that you can also use for ambient light (both incident and reflected).
As for technique, there are many examples of what to do to get good results on the internet, and if you can put up with the Geordie accent and can spare the time I would have a look through the series of videos on youtube, search for Studio Lighting demonstration by Ken Henderson APAGB
Hope this helps.