Ok. Let me start by saying 5 gallon is too small for a molly. They can grow upto 5 inches long. I have seen them that big.
Cycling the tank means building up the good bacteria in the filter to handle the waste that the fish produce.
There are 2 things you need to keep an eye on. Ammonia and Nitrite. These need to be at 0. Any higher and fish will die with poisoning. At the moment your ammonia will be sitting very high,dark green on the test chart. We need to tackle this. What I suggest you do, is a large water change immediately. Do you have any live plants in the tank?
If you want the fish to survive, you need to handle the ammonia and will need to do a fish in cycle. Water changes, water changes and more water changes! I did not know about cycling either when I joined 2 years ago and I had to do a fish in cycle too. I was doing 3-4, 50-75% water changes a day to tackle the high ammonia.
You should also buy a test kit for your water. This way you can keep an eye on stats after every water change. Also go to the beginners resource section of the forum, there you will find everything you need to start your tank.
Now you know you need to cycle your tank, you're here on this forum and we are all here to help.
What I mean by surface agitation is-does the water that comes back out the filter, ripple the surface of the water?
If you need anymore help just ask.
Have a read through this thread, it tells you everything you need to do to start the cycle.
http
/www.fishforums.net/index.php?/topic/224306-fish-in-cycling/
Good luck and keep us updated.