Life is a personal journey. There is no timeframe for getting back into the dating scene. You move at your own pace.
As for what to say about your ex....etc. You'd be surprised at how little people want to hear you talk about past relationships. Men in particular are turned off hearing a woman constantly talk about her ex. Unless you are asked a specific question there is no "upside" to bringing up an ex while on a date. Your focus should be on "today" and the person you are out with.
If you are thinking about how to talk about your ex before going out on a date then you are not ready to start dating. Your future lies ahead of you and not behind you. Best of luck!