Hi 42jbb -
can you please explain what you mean with "Russian silver" until 1917?
Plain Silver, Niello, Enamel, Icons, Church silver, Flatware, Hollowware?
The same with silver from USSR after 1917?
It takes you several years to understand what is what - books are only a minor part - what you need is own experience or the experiences of serious collectors with real objects in your own hands. Or you read the past 5 years on this forum to get an impression what is coming your way.
Here some books which can be helpful - some expensive - some out of print and hard to get - some very good - some only conditionally trustworthy.
The world is full of more or less authentic looking fakes. If you can not 100% distinguish you loose money and interest very quick.
My advice: start small and learn, learn, learn! Read the forum - contact the forum - ask the forum - before you buy something!
I wish you the best!