I've been working with gouache for some time and want to take a stab at oils
If I want to just do practice and studies would just white and a black suffice?
I'm afraid budget is something that limits me.
Also, any favorite brands?
white and black is enough. if you have budget problems I have a few suggestions.
instead of buying a canvas every time you can paint of cardboard.
you need acrylic gesso. https://en.wikipedia.org/wiki/Gesso
either that or wood glue (+ white acrylic paint).
I prefer the second option. I apply a thin layer on cardboard. I don't use white arcylic because I will paint over it anyway and it is waste of paint. Wait for it to dry. Now you can paint with oils on cardboard without fear it will fall apart.
this is you? its gorgeous!
i'd start with like a tube of burnt sienna or umber and practice underpainting on a white gessoed panel, cardboard is a little questionable in my opinion but particle board or cheap wood panels are great. ive had teachers in the past recommend gesso-ing rives bfk paper but i really hated working on that, and you had to heavily gesso it to get a completely non-absorbing surface. also pva size the panels before gessoing.
brands, in my opinion & off the top of my head:
Fantastic: Old Holland, Mussini Schmincke
Very Good: Williamsburg, Gamblin
Good: Utrecht, Blick