Great that you want to help us to build a Scratch Wiki in your language! There is already a small community of your language, see: Spa:Test_Scratch_Wiki_Home and Test-Scratch-Wikis#Spanish Wiki (Español). Best places to start is the International-Scratch-Wiki-FAQ that tries to answer any question that could come up.
This might be interesting:
- S:FAQ#What should be my "first steps" after my account is created?
- S:FAQ#Where do I find a basic introduction for editing the wiki?
- S:FAQ#How do I start a new scratch-wiki if there is no one for my languages ?
- S:FAQ#Could somebody help me?
- S:FAQ#How can I see what's going on on the wiki?