I have done the Baby Show at NEC working for four diff organsations (including mumsnet when the book launched, and I think it was the first Baby Show at NEC. Unfortunately we didn't sell many )
The pack from the NEC will say that you need fire retardant/resistant fabrics to use as drapes. It is very comprehensive (or the one I've seen was) and spells out all rules and regs, loading unloading, when you're allowed to pack up, whether you can have people wandering around.
The best stands, it has to be said, have huge display posters for the background - it can look a bit tacky and unprofessional if you just have even A1 or A0 size posters to stick on the shell walls.
I would suggest having something cheap but useful and branded with your logo and contact details that you can give away to everyone who passes e.g. bottled water (it gets very hot at the Baby Show), pens or something which women will find useful in pregnancy and early parenthood so they keep it around and don't just throw it out.
You're not allowed to protrude beyond the limits of your stand i.e. have a table half in and half out and make sure you are the customer side of your stand, not standing behind a table, whilst ensuring people have easy access to info in case you are talking to someone and can't get to them.
It's sad but true that you will be one of many companies vying for people's attention and don't expect to come away having made millions of sales/bookings and set yourself up for life but if getting your name out and about is all you aim to do then this is as good a chance as any.
Have fun - I may see you there.