When I go to stop brake pedal will go to floor.

First this is a pretty serious issue and we need to resolve it before you continue to drive it.

Here is a guide that will get us started on this issue:

https://www.2carpros.com/articles/brake-pedal-goes-to-the-floor

However, I suspect to start you are low on fluid. So we need to top that off and then start checking for leaks.

If you are not low on fluid then we need to most likely replace the master cylinder but we need to check for leaks first as well.

Once you confirm there are no leaks, I would replace the master cylinder as it is most likely leaking internally. Here is a guide that will help with this:

https://www.2carpros.com/articles/how-to-replace-a-brake-master-cylinder

I attached below the process for replacing the master cylinder and bench bleeding it.

You will then need to bleed the entire system. Here is a guide on how to do that:

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Please let us know what questions you have. Thanks