I am guessing you may not have had a violin long, but presumably you are having lessons so the first port of call is your teacher.
There are a few videos on youtube and on other violin websites which show you how to change a string, but seriously initially I would ask your teacher, it is not hard but there is the possibility of badly damaging the violin if you do it wrong and the E strings are liable to snap easily if tightened to quickly, too high to start with.
If you have a student violin there is probably more chance of damage as the build quality may not be terribly good even if it plays ok.
For even minor repairs I would find a local luthier to do them, they will usually put the strings on for you when you buy them from the luthier.
Check for any cracks regularly, keep the violin clean of rosin as this will dry out the wood, never use anything alcoholic on the wood of the violin, you can buy violin cleaner but really only need to use that rarely and in tiny amounts.
You can clean a build up of rosin off the strings with a tiny amount of cologne or string cleaner on a little cloth. Treat your violin like a delicate bird, be it wooden , and never apply too much pressure on any part, or drop it!
There are probably books but I would not attempt to service my own car even with a book!