What do u mean by should say or not to say? Tell everything, there is nothing new that u've done, go to the church and contact one good senbet temari and then ask them to get u to good niseha abat that can keep u close. Just don't confess on the first day of ur meeting, for the first day ask him to teach u about niseha, and how to do?, then even if he asks u to confess tell him u want to be ready, and do it on the next meeting.