1,童子功很重要,想学什么乐器,三岁开始要请专业老师。
Start from Five year should be fine. Saw a concert pianist who started at 19.
2,家长要花时间陪练,没有小孩可以一座几小时苦练。
Yes, Yes.
3,要舍得下棍子,原理同二。
Parents need be creative, maybe "下棍子" occasionally, can't do that constantly.