It can be hard to find exact track plans for a given space, but keep in mind that you don't need to use an exact size either. If your space is 6x10, a 5x9 would fit, for example, and any extra space could be used for 'scenery' (if on a carpet, whatever you want to use.....
There are books of toy train layouts, CTT has some decent books (I have their one for small and midsize plans, some of which are for fasttrack, others probably could be done with fastrack relatively easily, as long as they don't use specially cut rail or a lot of pieces fasttrack doesn't support.).....I don't know if the forum premium membership allows looking at prior issues of OGRR magazine in digital form, that is another possibility as well...
WEBMASTER NOTE:
The OGR Forum Premium Membership allows viewing of back issues to December 2009, Run 239.
With your basement, you have some options. My basement is probably the same size as yours, and it has a pretty low ceiling, little over 7 feet or so.....and that can be tough. Standard hung tile has a 4" drop, which may make it a bit too claustrophobic. Others have handled this in a variety of ways:
1)Sheetrock the ceiling. Problem here is if you want access to the pipes and such, won't allow it.
2)Spray paint the ceiling black, which tends to make it 'disappear'. Advantage is you don't lose headroom, don't see stuff, but it can be messy, you would need to mask certain things like junction boxes or anything you don't want paint in, but people have done this and it is does work
3)They have ceiling tile systems that use flexible channel to hold the tiles (the channel doesn't 'hang down' on wire, the channel screws into the joists in the ceiling, the tiles can be put in because the track is rubbery..Lowes had it, not sure about HD.....you won't lose headroom, but it also takes some serious installation work (if you can afford to have someone do it, might be a good option)
4)I have also seen where people put up tile directly to the joists, using various forms of attachment (saw one using velcro, believe it or not, not sure how that worked..but the tiles could come down if needed), some use panel nails with white heads, others screws. Acoustic tile is pretty light, and is somewhat easy to work with, but can be messy when cutting it and such.......probably not that impressive looking, but it works.
The other big thing with the basement is the floor. If your basement has the possibility of flooding, I would not put in a regular floor, but rather would use rubber tiles or matting that if it floods, can be dried out. As a friend of mine found out, dricore sub flooring is great stuff, but if it gets wet, it basically has to be ripped up and thrown out..on the other hand, if you are lucky not to live in an area where a)the basement floods/high water table and b)don't lose power and have a good drain/sump pump system (or have a good generator backup), then doing a full floor may be nice...you want something easy on the feet, rubber flooring is pretty cheap, and can be easier on the feet..