Will the domain be registered under my name/details?
And will i be able to renew the domain myself after the "validity" ends?
if you transfer the domain. yes you can renew it. and you can change the domain registrant info by your self. it already has domain privacy protection so yah
How do i change the domain registrant to myself? Do i need to get in touch with you after 3 years or something or can i do it as soon as i buy?
Sorry never really bought a domain before but i wanna get one for my web design portfolio