Bus is the easiest and the cheapest way to get from Simferopol to Sudak. the bus station is conveniently located just at the corner of the railway station. (if you arrive at the airport, take either a marshrutka or a trolleybus to the railway station).
after exiting the Simferopol railway station, turn left and walk toward the bus platform "Kurortnaya" (50 meters walk, next to the railway clock). ignore all touts, who will offer you "cheap" taxi rides, as well as those who will try to lure you to their private buses (the private bus will not leave until it is full). you will see many buses leaving in different directions. the destination is written on the sign, located in the left corner of the bus front window. (knowing Cyrillic would definitely be a plus as all bus signs are in Russian). the departure time is also stick to the front window. there is no need to look for a ticketing office, just get into the bus. the driver will come over to collect money.
a bus ride to Sudak is two hours, thought it might take a bit longer. a one way ticket cost UAH 25.6 (around 2 euros)
there is just one bus route in Sudak, marshrutka #1, which connects two sides of the town, Dachnoe (east) and Uyutnoe (west). the marshrutka stops at the intercity bus station, the mid-way. if you want to go to the center or the Genoese fortress, make sure to ask for Uyutnoe direction. the fortress is the last stop. there you can also change for marshrutka #5 to commute from Sudak to Novyi Svet.