Make an object look in a direction

Hey guys, im new in Unity answers and im pretty new with Unity too. I have been working lately on a little mario galaxy-like gravity project. My aim isto make a character walk around 3 objects as they are planets. I figured out how to make my character walk on it using rays that detect the center of the nearest planet. Problem is i cant make Y looking Up. I really dont know how to make the Y of my character looking up using the ray's direction.. I hope it is possible ! If you guys could have some answers, that would be really nice, i cantfindany tutorials that shows how to modify theangles of an object without using quaternions ! Also im using Bolt, that doesnt make things easier for me.... I hope yall having a great day !