the resources I have listed are excellent. I highly recommend you take your time and work though them. Understand the period.
I use a Google spreadsheet and list all components I need to source.
After reading the material you should soon come up with a list of the best for that period. Come up with other options for each component.
Enter those on the spreadsheet.
When you find sources note them as well. It is unlikely you will remember all the search results.

I tend to go for best of the newly emerging component models for the year, and if they remained in production for a number of years (because they were good) then the prices are generally sensible. I resist the temptation to put more modern components on period frames. It is not my style. If I want more modern components then I have another bike from that era!

Another way is search what these riders were using, https://www.flickr.com/photos/673944...-j6DwJk-oH3HDv

and another well photographed listing of bicycle components are at Speedplays Museum
https://www.flickr.com/photos/speedplaypedals/sets/

Original hoods are likely to be badly perished. So a few make reproduction hoods.
David's excellent tutorial http://www.bikeforums.net/classic-vi...ria-hoods.html
My Shockstop 'honking rubbers' If you can't find it... Shockstop 'honking' rubbers - Australian Cycling Forums - Bicycles Network Australia

But most people will buy the reproduction hoods from others.
That is why I suggested that you come up with lever options and then search for what hoods are out there readily available. Or do a search on threads on the Bike Forums for reproduction hoods.
I bought some Weinmann hoods from Frenos y puņos - Reciclone after I found this https://bertinclassiccycles.wordpres...oods-a-review/
So this allows you some scope as to the brakes. If you wanted GB brakes and levers of the time you are competing with collectors of 1950s bikes also very keen to have these hoods as they dated from the very early 1950s.
http://veterancycleclublibrary.org.u...20Library).pdf
the superhood rubbers are very hard to get, and are fragile. I had to buy a number of sets and I will keep one for the making of a mould (if needed).
So do your research and note your finds and observations.

And ask back here. There is a good chance a member has already found that hard to get part.

Some of my projects have gone on for 4 years while I research and collect the parts. Others are in a few months. I enjoy the journey as well as the destination.