When dedicating my soul to Satan do I have to take blood from my index finger from my left hand or can I cut my palm?

I'm a new member, and I see all this talk about Jews. Are Jews evil in Satanism? Also, I bought a black candle today, any beginner rituals I can use it for? I have yet to perform a full-fledged ritual, so far I've just been meditating and directing my energy to help myself and others.