Hi,
I have a few questions regarding your service since I am interested in it.
Which countries available? Can it be worldwide shipping to any country which on DHL list or you have limited countries?
If UPS/DHL/Fedex/Purolator ships between the origin and destination countries, I can offer this service - so yes, if DHL ships to a specific country, I can provide an estimate for delivery to that country.
Who is official payer for the shipping: you or me? If there will be a problem with parcel, will I contact with shipping company direct or through you?
I'm the one paying for the shipping cost (since these shipping companies don't accept bitcoin), but if there are any issues with the parcel the shipper (you) will be responsible for contacting the shipping company directly because your name will be listed as the sender of the parcel.
Do you accept escrow or full prepayment only?
Thank you! 
Yes, I welcome escrow through trusted escrow providers. If you choose to not use escrow, I'd ask that the full amount be sent to me upfront.