Hi and welcome to the forums!
Without pictures it is very difficult to say please try uploading the pictures (Try uploading here
http://www.imagehost.org/ ) and you will get a much better answer.
The number 88 indicates the silver purity. The two most common purities used were 84 (.875 fineness) and 88 (.916 fineness). Yours ofcourse if the latter.
By the bird do you mean a two headed imperial eagle sign? This was a mark used on objects made by the court jewellers. It would help if you could show pictures.
Also for the mark in cyrillic letters do you mean it reads ИХ? If so, this is cyrillic for IH. This would suggest the maker Ivan Khlebnikov, who was a court jeweller although without seeing your item, it is difficult to judge wether they are genine or not - there are many many fakes around.
Sorry, but we do not discuss value on this site.
Regards,
Piette