beh... there many ways to do something BUT u will never do a gd mastering with out any hardware. what u can do inside of FL Studio is only a premaster, and another BUT depends of your track work if is Equalized well and have all sounds on them place is easy to doit a PREMASTER if not .....
anyway depends even of what genre u do. EX: if u do Minimal House and u want to create a premaster using Izotope vst's at the end it will be a mess, why?; izotope release a white noise in background (depends of your pc).or T-Racks that have awesome plugins but in minimal house is not gd,WHY? T-Racks have all what u need to create a gd premaster but only for Garage style or rock/urban/jazz whatever is Vintage, (natural instruments sounds/LIVE recordings).for digital music that u create on your pc it is very very gd and i suggest u is Sonalksys (for digital sounds) and Nomad (for both digital and vintage) try to use them both in all what u do EQ/Comp./filters all, combine them and u will get a great clean unique sound.
Tutorials on HOW TO: r not so gd cause anyone of us producers have his own style, if u try to master a project after some gd tutorials at the end u will not get the sound lik u want to.
yeah u can read them and see the difference between them and learn some about equalizing/compressing and all, but never i repeat never do lik them. use your ears and do your own premaster from your own style.