The first step is to choose how many? This will depend directly on their size and the amount of juice you want to prepare. Little by little and thanks to the experience you will acquire, you will be able to calculate this measure perfectly in the future.
It should be noted that if the oranges are tempered to the temperature of the refrigerator or fridge, it is necessary as a recommendation to take them out and let them adjust to room temperature, so that you can extract as much juice as possible.
Finally, you will only have to serve this delicious nectar that oranges offer you and for them you have several options, you could serve it with pulp and ice or simply just the juice, this will depend on the personal tastes of each person.