I would rather first have people to contact me via Bitcointalk PM(I accept PM from newbies aswell) so in case of people trying to steal/scam, it can then be documented and be reported on bitcointalk, otherwise I only have a telegram account, so that is why I ask interested parties to send their telegram username, so I have a relationship between their bitcointalk and their telegram account that can be documented.
The source of my asking price is my personal judgement of what I need to offset the price to make people interested, aswell as the current market conditions and what I minimum need to pay off what I need personally.