The best Ruqya is that which you do for yourself. Performing Ruqya will free you from evils that might be afflicting you.
However, to prevent that from happening in the first instance you should read Surah Al-Fatiha, the verse of Al-Kursi , Surah Al Ikhlas, Surah Al-Falaq and Surah Al-Nas as well as other supplications in the morning to protect you for the duration of the whole day then in the evening to protect you for the duration of the night.