[adrio]

To install my bbpress do i need to create a new database?

I would integrate in my wordpress using same users.

[fel64]

Nope. To integrate, the easiest method is to use the wp database.

[chrishajer]

Use the same database and just use the $bb_table_prefix = bb_ table prefix as suggested in the config.php. No need for a whole new database just for a few new tables.