Had after have in this sentences?

I have a doubt regarding following sentences when we use had after have, then sometimes it makes me confused. The examples are:

I have experience of four years. vs I have had experience of four years.

I have an ink pen vs I have had an ink pen.

I have a wooden bed, two chairs and a cupboard vs I have had a wooden bed, two chairs and a cupboard.

Do these sentence have same meaning?
If we compare tenses then sentence with have is present simple and that of have had indicates present perfect. But how can we correlate these sentence?

Good answers will be appreciated. :D