Happy to have you in the forum and hopefully you can find some answers to your questions but also find very useful info. with regards to your printmaking endeavors.
I understand your frustration wanting to learn printmaking techniques but not having a lot of resources in your immediate region. However there are lots of online tutorials (check out You Tube by typing in any printmaking medium in search and there are usually a wealth of videos posted).
In response to your question about screen printing using watercolor or gouache. You might have more success using watercolor as I think gouache is a bit thick and may clog the screen mesh quickly. From what I have read you paint on the watercolor pigment first and then flood coat the screen with a water based transparent medium which will activate the w/c pigment and transfer it to the paper underneath when you pass a squeegee blade over the open stencil areas.
here are a couple of links that might be useful
I believe many moons back I tried also mixing dry pigment powder into a thick gelatinous wall paper paste mixture and printed this through a paper stencil on stretched screen.