The basic difference is that 'let's get started' is right, and 'let's get starting' is wrong, it's not possible. However, you can say: 'let's get going'. The problem is (I think!) that let's get + ~ing implies duration. …
"Get on"、"get off"、"get up" 和 "get to" 都是英语中的常用短语，它们的含义和用法略有不同： Get on "Get on" 表示上车或上船，通常用于公共交通工具或船只。例如： I usually get on the bus at this …
