Hey /p/

So I recently purchased a Canon EOS 6D with the 24-105mm f4 and I am now trying to build up my lens collection. I have a bit of money to spend but I don't want to blow it on an expensive lens when something cheaper will do just as well from my purposes (total casual when it comes to photography; first DSLR).

So here's what I'd like to get within the next few months:
50mm prime
85mm prime
35mm prime
70-200 telephoto
Wide angle

Now, as far as prime lenses, the Sigma 50mm 1.4 Art has jumped out at me, but it's a bit more than I wanted to spend on one lens at this point. I could either go with the Sigma, or instead pick up the Canon 50mm 1.4 as well as a Canon 35mm or 85mm. Which would you recommend?

I was also looking at the Canon EF 70-200mm f/4L USM as a telephoto. I also noticed they have another one has image stabilization, but it's also about twice as much. Should I get the one with IS or go with the cheaper one?

Haven't looked too much into the Wide angles. Any you could recommend?

I know I'm kinda asking a lot of questions. I'm just new to this, and I was hoping for some informed opinions on the subject. Much appreciated.