Hi Sanchit!
1. There full documents about how to add-on at https://docs.kingcomposer.com
Btw, we are working to make it easier to understand and video tutorials.
2. You can try with element KC Box, it could do more than what you need
3. Yes, we are working on an add-on package with exactly what you are talking about
4. In the add-on package of point #3
You can get in touch with us anytime via contact form https://kingcomposer.com
