There is no general guidelines.
Marks can be struc in random order. They can even be struck upside down. And there is no assurance that they all are struck same way. You can easily experience that one mark of a serie is up/down.
You start here
http://www.925-1000.com/foreign_marks.htmlor use a general book like Tardy - read articles of silver, but also start learning of style and design.
We have a lot of variables - as time, place. And when you combine those you will see that for most places country could vary in time - Gernamy is not always Germany, but independent states, part of another country etc.
First find out - silver or plated? No idea in looking among silver if plated. As in periods makes of ElectroPlated used marks that should look like silver marks - just to confuse the (un skilled) customer.
I soppose that is where you are now. have identified plater, but cannot read marks. get help - picture can be a start - here you can get assistance. Take advantage and get an idea of how marks are read. They used Gotic letters. A pair of letters can actually be 3 because they used part of a letter as part of second letter etc.
Start here
viewtopic.php?t=10 read the Do's and reflect - why each bulletpoint. When you reflect of a bulletpoint, why has Forum Master written so? then you start getting an idea of the search process.
So my advice start to read a bit, then post photo and i am sure that someone will assist you in how to read your specific mark.
Once you get an idea of marks it becomes fascinating.
And one more point - silver marks are ment to cast ligt, identify.
Silverplate marks often used to confuse.
.