i can play guitar but i would love to start playing sax and learn to play jazz on it. I heard fingering on sax is easier than guitar
Do you play jazz on the guitar? If not, start out by listening to jazz and try to develop a conception and execution on this instrument with which you are already familiar. Your saxophone studies should begin with the fundamentals: developing a good tone and learning key-based techniques with regard to fingerings (some notes can be played with more than one fingering; context will tend to favor the use of one over another); until you have reasonable mastery of these you might sooner be more successful at brain surgery than playing jazz (point- there are fundamental skills that are necessary for one to be successful at each discipline).
Once you master one instrument, you should understand what and how to practice to develop and maintain proficiency. I've seen more than one musician take up a second (or even third or fourth) instrument and develop more than reasonable chops after several months of study, but I must be careful to point out that these musicians all possessed a solid jazz conception on their first instrument which enabled their pursuits. Perhaps the most shining example I recall is a trumpet player (heavily under the influence of Kenny Dorham) who got an alto saxophone, ran a slew of long tones. studied the rudiments of technique, and within a year was practicing from the Omnibook and had himself quite a sound. Or, the bass player (and former member of the English act Acoustic Alchemy) who got a chromatic harmonica and using the disciplines he already possessed developed himself a formidable bag of tricks on that instrument.