To + pronoun

Hi,

I'm an english tutor and I'm finding it very difficult to explain the use of "to" to my students. For example:

I gave her the book yesterday. This would be the correct form in my opinion.
I gave to her the book yesterday.

But instead

I went her for advice.
I went to her for advice. This would be the correct form in my opinion.

Can someone please help me.

Thanks.