You could try various types of interval session, plenty out on google tt forum etc. If you’re taking the trainig seriously what would be handy would be something like a garmin foreruuner 305 with the session you intend to do fully programmed in so just get out and ride, the watch bleeps when you have to sprint and stay in the right hr zone and bleeps when you have to rest etc,, a 305 has the advantage of being worn as a watch, some velodromes won’t a) let you have garmins and other projections on your bike b) wont let you stick stuff on their bikes. It still may be very dull and a turbo an easier cheaper alternative:-)