The particle ה is sometimes added as a suffix to reverse imperfect. Accordingly this book it seems to not change the meaning of the verb.
Interrogative particle ה
In addition to denote a definite article the prefix ה may mean a question (“whether?”).
Example: הטובה הארץ (Is the country good?)
Direction suffix ה
The suffix ה can be added to some words to mean a direction. Example: צפונה (to the north).
An irreal condition is introduced by the word לו (or לולי or לולא with a negation).
Sentences starting with ויהי
Sentences starting with ויהי (the reversed imperfect, 3rd person, singular of the verb היה) may be translated as “It was … that …”.
In texts about future, there are similar sentences starting with the reversed perfect והיה which may be translated as “It will be … that ...”.