Welcome aboard. You may wish to post on the Dating and Friendship
sub-forum as it is more suited to personals ads than the Introduction board.
For the best chance of success, be specific about who you are and what you're looking for. Suggestions include (but are not limited to): Age, gender, interests etc of you and your partner, preferred age, gender, interests etc of your potential third. Expectations as to number of children or other partners she might have, your willingness to travel, whether she would be involved with one or both of you... and so on.