Procedure Creation

I have to create a Procedure called customer_insert which inserts a record in the customer table. The input to the procedure should be all attributes of customer table except customer_id. This Procedure should use a sequence to generate a new customer_id when it is inserting a new record in the customer table. The rule for generating customer_id is that the minimum customer_id should be 1000 and customer_id should be incremented by 1 for every new record

this is the cust table created
create table CUSTOMER (
CUSTOMER_ID NUMBER(6) NOT NULL,
NAME VARCHAR2(45),
ADDRESS VARCHAR2(40),
CITY VARCHAR2(30),
STATE VARCHAR2(2),
ZIP_CODE VARCHAR2(9),
AREA_CODE NUMBER(3),
PHONE_NUMBER NUMBER(7),
SALESPERSON_ID NUMBER(4),
CREDIT_LIMIT NUMBER(9,2),
COMMENTS VARCHAR2(256));

I thought of creating a sequence first and then use the sequence inside the procedure to create a new customer_id ....didnt workkk...

any clues?