Kitabimin baştan savma okunmasini istemedigimden = Because I didn't want my book to be read sloppy
1. "bastan savma" is an idiom. It is not meant the beginning of the book. If so, it would have been "Kitabin basi"
3. It(-den) is not "from" here. It means because, since.
2. Kitabimin bastan savma okunmasi = My book being read sloppy
And if istemek (to want) is used in -i hali. okunmasi + i and you need a letter between these two vowels, kaynastirma sesleri.