new bike-need knowledge

[Lee boy!]

Hi great site,could someone let me know what voltage i should be charging the battery from yamaha dt 125, 1995 some some 6 some say 9 and most say 12 WHAT IS IT? -- also would this be a dt 125 lc or a dt 125 r ? I need both parts of the exhaust,does anyone know of a good website that sells them at sensible prices and i also need the rubber strap that holds the battery in place only mines rotten,,need info on proper sizes and types of front and back tires as its been fitted with the wrong ones :sick: ,i know they are supposed to be slightly chunky but i want them more for road use rather than off road-- and need a sprocket and chain set,know a good website? thanks and bear with me as i may be nearly forty and just starting out, but i am trying to revisit the youth i left behing long long ago. thanks lee
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New to bikes,old to life!