2 problems with TRIGGERS in MSSQL

I need 2 triggers on MSSQL
I have 2 tables SECOND and MINUTE
In SECOND table is resived information in every second.

1. Now i need to copy in every 60 second - one row(the last row) in MINUTE table
((TRIGGER ON INSERT)if Index devide on 60 -> then put this row to MINUTE)

2. SECOND table must be <=240 rows
(TRIGGER ON INSERT) if row(SECOND) count>240 -> do insert, But last (Min(Index)of SECOND) -> DELETE)

PLEASE HELP me to Write this TRIGGERS