Hey, Welcome to the forum John(juancheco),
It's a pleasure to see people from around the world joining in, and speaking English is an added bonus for you - Respect to you man.
If you do run into some trouble with the language barrier...I put in a translator on the side of the page...not the best, but as I hear from other non-english speaking members it works pretty good most of the time, so enjoy.
People here are great and despite me being absent from the forum a few days at a time, they won't leave you hanging and are sure to help you out with what ever questions you have...I'll also be checking in on occasion and will post something useful.
Since you are new and the "New Members Links" panel isn't ready yet, allow me to direct your attention to this wonderful Wiki that one of our members put together.http://thearbalistguild.forumotion.com/t308-crossbow-building-wiki-published#2276
If any questions come up, throw them in one of the "Design discussion & Construction help" forums found in the Crossbow Workshop section.