If yes how easy it is to get H1B or it is same lottery system? What happens to the job of your working spouse when you transfer L1 to H1B? Does she also need her own H1B immediately?
Generally almost every company files h1b after l1
A big yes
If you change status from L-1 to H-1B then your spouse immediately goes out of L-2 status and her employment authorization will be revoked forthwith. If she's not able to get her own H-1B or other work authorized status immediately, then she won't be able to work in the US for a period until she gets the H-4 EAD, AOS pending EAD, or similar based on your GC application.
Thanks for the information
Do you have a US masters? - 45% chance No US masters? - 20% chance. Its easy really, and data is available for you online to calculate