Alberto,

Bruce88123 was correct, I did not know what your experience was in building, you sounded like you were just starting to build. I hope I did not offend you.

The suggestions about Airfield Models is a good one, there is much info on building, tools, materials and such.

Dave Platt http://www.daveplattmodels.com/ , has good information in his videos but it can get expensive to get all 22 (over $600 US). I'd start with the "Scratch This" series. RC Scale Builder http://www.rcscalebuilder.com/forum/default.asp has reviews on many of these tape/DVDs. Also check the RCSB General section on Scratch Building.

Bruce is also correct on the sandability of the glues, just make sure they are completly dry first (overnight or more).