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Peter Singer on vegetarianism

For my college moral ethics class we have been studying moral ethics around animal rights/interests. I recently read "All Animals are Equal" by Peter Singer and just wanted some more clarification regarding his utilitarian view on reasons for vegetarianism.

So far, I've deduced that he believes that people should become vegetarian because killing animals causes pain and suffering which is not in the interests of the animals. Because it eating animals causes them pain and suffering, we should not eat meat because the pain outweighs the pleasure that is derived from eating meat.

I am just slightly confused because he argues that animals have equal consideration but at the same time says that not all living beings are equal but if not all living beings are equal, what is the reason as to why people should convert to vegetarianism?

On another note, if it was painless to kill an animal, would Singer say that is okay to eat meat?

Also, if I've analyzed anything incorrectly, please feel free to correct me! I would like to grasp this concept as best as I can!
gpt
He claims that all living organisms that feel pleasure and pain, that are sentient, deserve equal moral consideration. He has a quote where he says "moral considerability lies somewhere between a shrimp and an oyster". This is because shrimp are sentient but oysters are not, despite being animals. Plants are also living but don't feel pleasure or pain, are not sentient, and so don't deserve the same moral considerability. 

Yes, he has claimed that if you could kill an animal quickly, painlessly, and away from other animals which it's death would cause distress towards, and that the animal could save the lives or alleviate the suffering of others, killing it could be moral. But as a utilitarian, he is kinda obligated to this, even with humans. But,  that isn't a reason to support the animal agriculture industry since they do not operate like that and because animal products are not needed for survival 99% of the time in humans.