Sameera, 9 weeks is too early for him to be weaned, he should still be getting handfeedings and Tari is right, take him back to the breeder for that if you have any doubts about how to do that.
The other behaviors are consistent with greys, he will want to explore his world and he wants to be with you and that is fine, but he needs to be able to entertain himself for periods of time and not be dependent on you for that.
When he comes off his perch just put him back, you will have to do this thousands of times, but eventually he will understand that he has to stay where you put him.
Reading all you can is good and we have a lot of useful information here on this forum, so use it for all its worth.
Please keep us informed as to what you do about getting him back into handfeedings, we want to know.