This is really far too broad to cover in a few paragraphs, so let's just hit the basics…
Oh… one thing this is not going to be is rapid.
You are not going to learn this stuff in a week or even a month. It's like saying, "I want to be a pilot" & expecting to have your wings by next weekend.
The 'keyboard workstation' is out of vogue these days, since you can do it all with a single DAW [Digital Audio Workstation… what they used to call a sequencer] & a shed-load of plugins for soft synths [commonly called VSTi, whatever the plugin type actually is].
You will need a keyboard 'controller' - basically just something to generate the midi notes that the rest of your system will play back.
The first thing you'll need is a computer with a lot of 'grunt'. People do do this on laptops, but it's a bit like trying to get a double bed in a mini, when you really need a van or a truck.
[Opinions will vary on this, but to my mind the less powerful your computer, the more time you'll spend working around getting it to play everything all at once & more time on tweaking, bouncing & finagling the machine rather than getting on with the job.]
Whichever DAW you choose you'll find as many people hate it as love it - it's down to personal choice. Big hitters are Cubase* or Logic, with perhaps Ableton or Reaper following along behind.
These all tend to come with some fairly decent synths & effects plugins these days, so splash out on "the good stuff" only after you understand the "free stuff".
Synths - you can get almost anything you used to get in hardware, in software. Look at Arturia for a huge selection for starters, from an old Wurlitzer or Rhodes piano, Hammond B3, ARP 2600, DX7, Synclavier… you name it, they got it.
There are also a myriad [by more companies that anyone could list] which are not based on anything that ever existed in hardware.
No-one can choose a mic for you. No good buying one for podcasts to do 'proper' vocals. First you need to know what you want & why - see https://www.sweetwater.com/insync/studio-microphone-buying-guide/ for a guide then you need to hear some… https://www.sweetwater.com/feature/vocal-mic-shootout/
Same for audio interfaces - https://www.thomann.de/gb/usb_audio_interfaces.html - one for every budget.
Studio monitors - not even going to start on those.
You can see from this very brief intro that you need to research each aspect - no-one can simply point you at one of each & say "Go".
Once you start to accumulate your gear… then there's just the job of learning how to use it…
…you're really not going to do that in a weekend ;)
*Cubase comes in several variants, from 'beginner' to 'I earn my living doing this'. Logic has a baby brother, freeware Garage Band, but is Mac only. The others I don't know so well.