use auto_increment.
If you want to use a higher value than 1 for your auto_increment value then either set up the table with it or use alter table to change it.
It needs to be a myisam table and not innodb table though.
Code:
create table testing(
id int primary key auto_increment,
firstname char(12),
lastname char(12)
) type=myisam
auto_increment = 34533
;
and that value is the first one that will start in your id table.