MotorsportDays.com will have given you plenty to choose from. Pick a track near home. Some track days are better than others for novices. Single make ones are excellent, such as Lotus Seven or manufacture days, and I would recommend joining a club appropriate for your car.

Choose a day with groups rather than an open pit lane. That means that you can choose to go on track at the same time as other novices and people who have not done much track driving. Each session lasts about 20 minutes and you should get five or six sessions in a day, or three during an evening session. It might not seem a lot, but it really is plenty and gives the car a rest between sessions. It will also mean that you will drive out on track at the same time as the others and not have to blend in with fast moving traffic.