When writing romance, the usual method is to have the hero and heroine each having a viewpoint. This can also be done for other types of stories and done in several ways. There are rules to follow when doing this. Having the reader's identify with a character is an important thing.
When using two viewpoints, you can use alternating scenes, alternating chapters or some variation. One trick is not to jump from head to head in a scene. This could bring the reader whiplash. Another thing to do is to show the reader this will be the structure of the story especially when beginning the story. Shorter passages will show how the viewpoint will shift in the story. One of the problems is if the scenes are too short, the reader may not have time to know identify with one of the characters. Once the pattern is established, the scenes can be longer. I've read books where these opening viewpoint scenes are merely paragraphs and rooting for the characters to overcome their problems doesn't seem to let me like or dislike one of the characters.
Another method is to have the story told in parts with one character's viewpoint being used for a particular time in the book in Part one. Part two then shows another character taking up the story.
No matter what method you use, make sure the scenes or chapters are long enough to brina an investment in the character and not so long when the viewpoint shifts, the reader won't wonder what's happening.