I need help with some main arguments for Primate Cloning PRO (also how to say why it is inhumane, to fight against the CON team) I need evidence and facts on this, especially why it is not inhumane to do this and why it is a good thing

A great question. As I'm sure you know, a key factor in debating is knowing what the other side is likely to say; as you state in your question, it's likely that you'll have to fight against the protestation that cloning of primates is inhumane. Whether or not you think it is, as you are fighting for the "pro" side of the debate, you'll need to equip yourself with an argument against this.
On the face of it, it is difficult to say that cloning primates is not inhumane, given what we know about the capacity of these animals to feel. However, you could begin by breaking down the meaning of the word "inhumane." Technically, it means "without compassion for misery or suffering." We might argue, then, that cloning of animals in and of itself is unlikely to cause the animals in question any misery or suffering. The animals are not advanced enough to suffer psychologically from the knowledge that they have been cloned, and gene extraction and manipulation should not cause any physical damage to the primates used. Indeed, much cloning involves embryos and other cells that do not feel, and any gene therapy performed on adult primates would involve the use of general anesthetic.
Some other possible pros to cloning primates:
1. Primates are the closest genetic relatives we have. It is sometimes necessary to carry out experiments on them in order to help cure fatal diseases in humans, including cancer and other diseases. Having cloned animals to carry out this research upon reduces the chance of wild populations being driven to extinction by human need for research.
2. Further to this, we can argue that the ability to clone primates will help us preserve endangered species of primates in the future, where existing methods have proved less effective.
3. Cloning enables scientists to preserve the best genetic traits of an animal and get rid of others. This means we could use primate clones to practice genetic modification techniques which could help eradicate genetic diseases in humans. This is only possible using primates, as they are close relatives to us.
4. The argument that cloning primates will lead to an attempt to clone dead human relatives is a straw man. Cloning is also not intended to allow people to replace dead pets. Instead, it is generally for the pursuit of scientific goals which will benefit humans, such as producing viable biological samples which could be utilized in humans, including organs for transplant. Cloning of primates may not entail cloning the whole primate, but simply cloning primate organs.