Almost all gods can be evoked, by which I mean summoned into clairvoyantly visible sight, or on occasion into an object or location.
Images of the god in question made by someone who’s actively working with them, or at least very much believes they’re real, are one route - there should be some online you can try as a starting point.
If you want to be more classical, you could locate a sacred grove, or create a wooden idol, you’ve probably read about hisorical changes in the accounts of how our ancestors worshipped the gods, from a sacred grove to using anthropomorphic images.
I personally think all are valid, and will be far better routes to evocation than the ones used for demonic forces, such as the “triangle of the art” and certain incense.
At first you may just feel a presence that’s aware of you but not interacting (like of like parents do to their kids, keeping an ear on them but talking to another adult) - later, you should start to form impressions of communication, maybe through words, images, symbols, etc, developing into full-fledged telepathic communication. Or, on occasion, they’ve been waiting for you and will just start chatting right away - there’s really no “normal speed” fpor this to happen.
Can you make pacts with Odin in this way?
If you can evoke any spirit (umbrella term for non-physical being) and interact with them, you should be able to approach them for a pact, and discover what the terms are.
Terms will often be both ways with gods - bu which I mean, they will require something of you, and you will probably need to negotiate (you do NOT have to accept the first terms offered! In fact that’s usually a bad idea) and then seal the pact.
First pacts made with a spirit are usually best limited to one week or one month, later when you discover how you work together, you could go longer term.
You can find the different planes and the spirits and locations within them by astral travelling, check your PMs because I’m going to send you a quick tutorial for a simple method to get started on this, and there’s also a course available through this site - Mastering Soul Travel which looks into this in depth and with a far more magickal and versatile slant, than the paradigm I use.