Freshie maybe going salt with my 300 gallon?

[Hustler]

Well after a long and joyful hobby of freshwater monsters Ive finally decided to make the switch to salt and just start very slowly working my way to a reef setup.
I have about a million questions even though Ive studied up and googled and you tubed just about everything i feel like I still need to ask
once i get my fish out of the tank I do a complete tear down, get rid of most of the bio in the sump and then start it like a brand new tank going salt correct?
I would like to get it going soon so I can get the live rock in there and bubbling away with some base rock....Im in no hurry to get fish in there I just want to do it right the first time. Any advice is worth gold to me.