The oldest plants were pollinated by wind blown pollen.
Are you saying that there was a time when
only wind-pollenated plants existed? Could you help us verify this?
What happened is called co-evolution. The plants and the insects evolved together. Some insects fed on flowers, and accidently carried pollen. The plants evolved to make use of this, both by making the flowers more attractive to insects, and by making their pollen sticky so that the would better attach to the insects. There were then further successive stages of co-evolution.
Are you
sure this is the way it happened? Or, would it be better to say that most scientists
believe it happened approximately like this? If you are
sure, then could you provide us with the evidences that make you, and perhaps others, so certain?
For your lung question, the first creatures with lungs were aquatic. The lungs gave them additional ways to get oxygen.
Just out of curiousity, what were the first creatures with lungs? Could you provide a few examples?
--Jason