Yeah I was thinking 8 gb since thats the minimum on a rMBP, think I will go with that
My posts on here so far have been (not very subtle) sarcasm, as pointed out by some of the more clever posters. But since half of the advice is so horribly misinformed and downright bizare (recently someone did indeed recommend 48gb RAM for word editing /nosarcasm), I think I have to start marking sarcasm with a sarcasm-tag as suggested. This of course defeats the purpose of sarcasm and is actually quite worrying.
You created this thread without any information on your usage and then poster started to give random advice.
After you posted your usage still posters continued to suggest: "Max out everything."
Let's be abundantly clear:
Are you aware that your needs can be met by any smartphone or tablet?
My original iPad from 2010 with 256
mbRAM, 16gb snail-storage, a single core processor and some gpu I am not aware of, can stream 1080p movies via an hdmi adapter and run pages, numbers, keynote and netflix.
For what you are doing
any upgrade is a money-donation to

.
The only things you should be considering is:
battery life, screen quality/estate, size and weight, connectivity and maybe the size and type of storage.
Anyone suggesting any other geeky upgrades simply doesn't know what they are talking about, is being sarcastic or a troll.
Even though not necessary for you specifically, I recommend this link:
https://forums.macrumors.com/threads/1756865/