Welcome to TE!

As far as I know, all you have to do is switch the bolt skewer for a QR skewer.

You keep the same wheels, it's only the "axle"/bolt/skewer that you replace.

(I have no idea how much they cost or which ones are best, but I'm sure someone here on TE does!)

Good luck getting the wheel off! Do you have a good local bike shop who can help you if you need it and help you choose a quick release skewer?