2. it depends on the job. also, it's a LC substitution case.
3. LC substitution, so with very ealy PD
4. Yes, but NVC part will start even before PD current.
5. yes
6. If you pass interview, you can pick up (or receive in express mail) the IV in a day or two.
7. Must use L1 (both petition and visa)
8. US company files L1 extension before expiration. If exceed 5 years limit, you can claim L1 time spent abroad and get extra time of the petition.