Indians on Student visa

Hi there
I am an Indian citizen coming over to study in Spain. My course is for 5 years one year of Spanish language and then 4 years of normal bachelors degree. so I want to know that what kind of visa will i get coz its a long term coruse? and also if i get a 5 years residency permit ( that what the agent told me and i read on other website too) will i be eligible for Spanish citizenship after completion of my course??? or then i have to get a permanent residency and then wait for another 5 years to get a Spanish Passport.????

my future depends on the answer to the question..
please help me out...

regards
Ams007