hey guys!!

i m thinking of making a grade 12 project . SO .... i was just wondering if i could really have great help from you guys in the sense..that what kind of transformers and capacitors i require for a really small amount of spark... as small as 3 cm .
so what i have right now is: 20m coil....for around 11inch long circular height.....and 5 m long thick wire for primary coil.... my main concern is the capacitor and the transistor...so for them i have no clue what to use but i have a whole cooling box(includes the transformer) from computer... and a transformer from TV(power transformer)..and ....10v transformer i brought from home depo....... now guys please help if i will be able to build it or not.. as this is going to be my tesla coil

thanks in advance.