H1B to L2 with I-485 initiation

[sjmoksha]

Hi, I am currently on H1B which is maxing out in 1st week of January (2 months from now). My spouse is on L1A. My spouse's company is initiating our Green Card Process. I have few questions :

1) If I get I-485 receipt before H1B max out date, can I stay in USA legally just based on I-485 receipt or I should get L2 visa
2) How to convert from H1B to L2 in USA and how long does it take currently
3) If I return to India prior to H1B max out date, how much time it could take to get an L2 visa stamped from India given the current scenario of emergency visa appointments only
4) I wont be able to work until I get a L2 EAD or I-485 EAD. Whats the best way to move forward with all permutations and combinations

5) In case I have to travel to India in next few months, what should I consider to be able to ensure legal and safe re-entry to USA 

Please suggest. Thanks in advance!