also, keep in mind that it will take you a while to build up your students to the point that you are making any money at all.
you will need good-quality toys, such as can be found at Bumps-to-babes, not the crap quality stuff at toys'r'us.
it is VERY expensive to get a good playgroup going. (I'm not trying to discourage you, merely pointing out what you may not realise.)
I have spent in the past 8 months about $60,000 on toys/furniture, $10,000 on books, $30,000 on arts & craft materials.
I run a modest playgroup centre. currently we have less than one hundred children per week.