Hi the morning the lines are shorter on weekdays to buy a Disneyland ticket and does Disneyland gets crowded on weekdays

Disneyland is busy whatever day/season/time you visit. Mid-week, mid-winter is the best time to visit if you want to avoid crowds. I was there last week and the Disney Castle was closed along with the Haunted House in the New Orleans area and other things like the canoe ride in Frontier Land, so there are some drawbacks to visiting at "quiet" times. That's the time they renovate. Also, Disney California Adventure park is generally always quieter than the main Disneyland.

Yes it's very busy on weekends, but I think the mid week it sometimes not as crowded during the off season. Buy tickets would probably be shorter in the morning. Also I believe you can buy tickets online.