Thanks for getting in touch, and welcome to the Gibbon community.
Have you looked at our timetabling guide:
It is brief, but should be enough to get you started, and you can then follow up with more specific questions.
In timetable schedule, sunday is not showing though i have enabled sunday in manage colums and timetables and also in days of week. but for some strange reason sunday is showing blank.
This was a bug in v11.0.00 that has already been fixed in the v12 dev branch. v12 is due to be released June 24th. Can you wait until then for this feature?
I am also facing the same problem, Sunday is not showing in class routine; glad that its fixed in version 12.