1.2 let your attorney talk to them. He should be able to explain the things in a formal way.

3. 就是名额的问题了. 联系的律师说最近忙着办绿卡的事, 要等到10月份才能帮我处理,会不会到时候名额用完了呢?

you can find another attorney ah.

4. 工资问题. 查了一下, 给我的salary比最低标准高的不多,只高几百刀. 这个会不会影响H1的办理呢?

as long as you are NOT BELOW that line, u should be fine.