I Have Hughes Net and Want to play Online with my DS, and Wii?

We have Hughes Net, and We Get a Daily Allowance of 225 MB... I'm trying to find out, if we hook up our Wi Fi Router and I play online with my Wii or DS will it Suck up our 225 MBs? if no I can hopefully convince my parents to let us hook our Wi Fi up, and then I can play Black Ops Online with My Wii :3 I really want to play online without worries of going over our Allowance Limit Thanks Any Suggestions will be much appreciated! if this doesn't work well have to wait until we can change our Provider, and that could take up 7 months, or Longer!!!! <.< and please no Haters <.<