So I've been doing a lot of research lately on demons. I really want to meet one in person physically, if that's possible. I learned the demons sigl and personality. unfortunately, i don't have money or materials to complete the ritual. Probably not, but is there like a phone number or someway to communicate. Are there other ways to come face-to-face with them?
If you have the name and sigil, then you may be best following the tradition from which those are listed. For example, the Solominic tradition relies heavily upon these sorts of things. Also remember that most entities have more correspondences than just a name and a sigil.
A short answer for your inquiry is that you cannot meet a spirit in physical form. They are spirits, and not physical beings. In almost every method of working with spirits, practitioners use some form of divination to perceive and/or communicate with the entity.
A somewhat longer answer is that you definitely need to study more. Getting into serious matters is not for the new student. My best advice is to choose a method to study, then to study it -- by practicing in addition to just reading -- for at least a year. Some traditions require more time. I know of at least one which requires a student studies, practices, and performs nothing other than banishings for a full year, before moving on to the most basic evocations.
The shortest answer is that if you have to ask, you are most likely not ready.