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Hi, where can i find resources to create my tshirt? (PSD, AI, CRD,
PICTURES, FONTS, ETC) is there any software or page to create high
quality designs ? Many thanks

Have you searched teespring or vector images on this forum? Plenty of information for what you are looking for.

You could search for 'Gimp' in Google and download and install it for free. Bit of a learning curve but I think there's plenty of tutorials if you search for them.

Here's a video (not mine) of how to use Gimp to create a Teespring design: