If you started the tank from scratch then 3mths isn't really that old; 6mths would be better but I'd really recommend waiting a year or more. I know there are countless hobbyists that have successfully added nems and clowns earlier, but the more patience you have in this hobby the easier and more successful you'll be.
I like bubble tips, they're great for beginners and experts alike. Personally I don't like all the odd ball man made clowns out there; I prefer what you find in nature, but regardless your tank will be large enough to house a pair of whichever species you like.
Good Luck...