as others have mentioned, youve picked the absolute worst time to start. prices are ludicrous at the minute, even for the most basic product.
i can send you a bunch of base from various sets and maybe a complete set if you like (free), which would at least get you started. but buying boxes/packs right now is not a cheap prospect.
the real problem is that if you encourage their collecting now youre actually giving them a life-long addiction which will eventually have them spending thousands a year.