Learning management system

Hi,I want to develop custom lms
Which should have following
Features:
1)Course & Content Management
This feature is a must-to-have in an LMS because it helps the teacher/trainer to design courses and create content for students/employees. May it be a course, quiz, assignment, or assessment test, you can create using this feature.

Skill Tracking
This feature helps the employee to learn at their own pace. They can collect all the material and complete the course at their own pace.
Analytics, Achievements, Statistics, Surveys
Having a feature that can provide detailed analytical reports regarding the progress of a student/employee, their achievements report, and overall statistics of the entire class or at an individual level. Teachers and students can also conduct a survey using this feature.

Gamification
With gamification in long and dry subjects, you can get more engagement from the learner.
Social structure
This feature helps students connect with teachers and other students.

Please share your approach, cost and time line.