Lord Vishnu: Avatars of Vishnu

                                                                  Q. It is stated that all the Vishnu forms are eternal. Are there separate lokas for the Kurma, Matsya, Varaha, Narasimha, Rishabhadev, Parasurama forms? If so why does the Bhagavatam say that the form of Narasimha was never seen by anybody before? And also what about the form of Lord Caitanya? If He is eternal, where is His planet?

                                                                  Q.  While preaching/discussing with a devotee, the following question came up. Does Lord Ganesha belong to the category Jiva Tattva? Also does Goddess Saraswati belong to the category of Shakti tattva? Are they eternal? One consequent question is - we know Lord Brahma belongs to the category of Jiva Tattva and if Goddess Saraswati is eternal, how is it that she will serve a different person as husband for every creation?  Understanding this will help in preaching to Indians, so I am asking this. Please forgive me if I could not address these exalted personalities properly.

                                                                  Q: Generally people know about Vishnu or Kshirodakasayi Vishnu. The general public has not heard about other Vishnu forms- Karanodayakasayi Visnu, Garbhodaka sayi Vishnu etc. and other expansions of Krishna: Immediate expansion as Balarama and subsequent expansions. Where in this information in sastras is available?
                                                                    We would like to know more about these details of different forms of Krishna's expansions and about Universal egg.
                                                                    
                                                                   

                                                                  Q. Avatar means to descend. That means all avatars exist in various Vaikunta lokhas. Do all avatars exist in the form in which they descend. For example does Lord Narasimhadev exist in the form in which we worship him, or He exists as a four armed Vishnu form. If Vishnu form then why is it that Lord Krishna and Rama are in the same form in which they descend?