you can check the tubular glue to decide if they need to be reglued but if they are more than like 2 years old they probably should be reglued. you should really only race on cx tubulars as there is no great way to repair on the road or trail while training and you cannot swap them on the fly like a road tubular with a spare because the way they are glued is much stronger than a road tubular. If they have a good tread that is for all around purposes save them for race day and get a set of tubuless clinchers for training and racing as a backup set. They are also easier to change to different treads if you end up really liking the scene. Its a lot of fun even with minimal experience so just get out there and race!