Creating A Insert Trigger

i am trying to create a trigger which when I insert a "y" on a student table in insCheck column, instructor table will create a record of the same person.

The reason is there are two tables are in my DB, student and instructor table. Student can be a instructor so whenever insCheck conlum in studnent table is checked as "y", instructor table should be populated.
Both table studentId and instructorId inserted as manually so that I am not sure how i should populate the instructor's table just fName, mI, and lName and I have go back to the instructor table and populate the rest of the table manually or is there any way to poppulate the insturctorid also while trigger is populate the name onthe instructor table.


My Two tables DDL are like down below

create table student(
studentId char(4) not null primary key,
fName varchar(25) not null,
mI char(1) null,
lName varchar(25) not null,
insCheck char(1) not null,
);

create table instructor(
instructorId char(4) not null primary key,
fName varchar(25) not null,
mI char(1) null,
lName varchar(25) not null,
instructorQual varchar(100) not null,
);

thanks for your help in advance!
gazawaymy