As someone said, 'you can do it the hard way, or the easy way'.
Like a dipstick I did it the hard way and bought sample packs of blades, 100 at a time, perhaps 10 were good, 60 were useable 30 were rubbish. I bought shaving gels, soaps and creams, another rabbit hole. I bought razors that were not right for me, my face looked like a butchers shop window.
The easy way is to take advice from what you read on here and do not be in a rush.
You already use my favourite razor, a Tech also from the 70s, mine has a very short handle, my other far more expensive razors are unused. My goal is never to be cut and achieve a good shave.
Blades are a personal choice and surprisingly varied, follow best advice. I have settled on Dorco Titan or Prime after using 40+ blades, I bought mine from Amazon at 100 blades for under £5, they give me 5 good shaves a blade.
Soaps and creams are personal, I tend to chop and change, a very popular one is from Yorkshire company Michells Wool Fat, right now my shaving cream is Palmolive shave cream which is £1.80 at Morrisons.
Brushes are another very personal area, each to their own, some will not buy badger brushes on ethical grounds and thankfully synthetic brushes have come a long way, I will get shot down in flames for this but I cannot see the benefit in spending a large amount of money on an expensive brush when all I want is a face covered in lather, I concede that expensive brushes usually look better on a shelf, as I say, personal choice.
Post shave for me is just some moisturising cream, nothing flash, I am happy with cocoa butter, Palmers do one which is £4.30 at Superdrug, it will last you months and does the job very well.
Edwin Jaggers are in Sheffield on Morpeth Street, they have a shop apparently, if I was in the area I would be tempted to call in,
I shave on a budget, as you can tell, we are all different.
Best wishes for a happy New Year and welcome to the Shaving Room.