Fixing up old bike to sell

After four months of hanging in my laundry/bike shed, it's just about time to kiss my old Giant Anthem X3 goodbye as I sell it to a friend. Among other things, it is in desperate need of having the rear (and possibly front) suspension replaced. Just wondering if any of you have replaced/fixed this type of suspension before, or know of anywhere where I may be able to get this fixed cheaply/for a less expensive price, as I'd like to find the most economic way of doing so. Got on it today and can hardly believe I ever rode this thing, it feels so small and slow!

I think the gears' bearings may need replacing too, does anyone know how difficult that may be to do?

Thaks