Welcome!
1. If you don't screw up or call out within 90 days. They may keep you. Depend on hiring needs.
2. Depends on sales & projects. Your hours may get cut.
"Yeah, if we could get two more back-ups to the front lanes, that'd be great." I had an ETL who said that once, and I wanted to respond with "what lane would you like me on, Mr. Lumbergh?"