For safety and logistical reasons, there are no official, physical locations, nor do we suggest people do this. Our anonymity is a strength against our enemies or other crackheads.
The best thing to do as a beginner is to follow the 40 day guide:
https://satanslibrary.org/hp_hooded_cobra_40_day_meditation_program.pdf
Once you have "graduated", you can continue the general layout as a structure for your advancement. In addition, meditation and prayer on Satan's sigil is like your lifeline to the Gods and should be used for emergencies or for really personal questions, in addition to the resources here. Once you have done the dedication ritual to them, you are their student.
Other useful links include:
What is Satanism?