Will you be floating just like space and how much does it cost for this and do you need therapy to do this?

Floating might be like how you imagine space. For me it's like a supremely restful nap in perfect solitude on the world's best mattress. You can buy 60 or 90 minute sessions for $60 or $75 respectively. There are also discounted "community float" slots available Mondays before noon for $40. You do not need therapy to float.

Their web site does a good job of answering your questions.

In addition if you like it, subscribe to one of the float plans for a monthly charge that you can cancel at any time.