Begin with a device to find the 440A. Use a pitch fork, metronome with 440A, piano, or my tuning reference HERE
Then tune the D just under the A using your ears and “Twinkle Twinkle Little Star” which starts with a major fifth. From there you can tune the G which as the same relative interval between itself and the D. Finally you can tune the E the same way and in most cases using the fine-tuner.
Fortunately all 3 open string intervals are the same on the violin just starting on different notes. G, D, A, E