Well, lets start with filter running. You should always run the filter when swimming regardless of the time. As far as when you away, that's where your have to test times yourself, maybe you can start with 11am-5pm and see if that seems good enough.
Chlorine, get a tester kit. Add if needed. Depending on the use, sunlight and so on, you'll go through chlorine from once a day like some people do to once a week like I have too.
Keep PH levels normal. If you burn through chlorine fast, invest in a solar blanket, that should hold it in more.
Shock it before using it the first time.
With all this, you should be good to go.