L1 to L2 Visa conversion

[visanewbie]

My husband and I, both work for the same employer on individual L1 visas. I’m planning to resign from my job soon(in next 2 months).

- Can I resign in USA when I’m on L1 visa?
- Can I convert my L1 visa to L2 here in USA? Or do I need to go back to India for interview?
- How much time will it take?
- What all documents are needed?

Thanks in advance.