SQL & PL/SQL :: Transfer Data On Uneven Tables

I'm having problems transferring data from one table to another as as one table as only 2 fields and the one data meant to go to has id which i just want to increment value because its primary key

table bill fields (name, age)Values (gate,85)

table oracle (pl_id, pl_name, pl_age) often wont insert cz data too short

this how i tried and failed

INSERT INTO oracle (TIME_ID) VALUES(SEQ_CUST.NEXTVAL)
(SELECT name, age FROM gates WHERE name = 'gates');

also tried

SQL> SELECT SEQ_CUST.CURRVAL FROM DUAL;
SELECT seq_cust.currval FROM dual;
*
ORA-08002: sequence SEQ_CUST.CURRVAL IS NOT yet defined IN this session

SQL> SELECT SEQ_CUST.NEXTVAL FROM DUAL;
1
SQL> SELECT SEQ_CUST.CURRVAL FROM DUAL;
1
INSERT INTO gate (TIME_ID) VALUES(SEQ_CUST.NEXTVAL)
(SELECT age, name FROM CRIME_ACTIVITY WHERE ID = '1');

or have both tables with