high tech questions

hey everybody.. looking for a little help. I am very familiar with low tech planted tanks.. I have for years ran a low tech set up.. with 2 t5ho 6500k lights(104) watt on a 75gal, with little ferts.. I would say moderately planted.. with decent results. but I am now wanting to up my game, and jump into high tech.. I know nothing about co2, so any tips you can give me will be greatly appreciated,, or any links.. also I assume my lighting will not be sufficient with a high tech. thanks in advance...