If you have any questions about Johnny's or Hey! Say! JUMP in particular, feel free to ask here and any of the members will be able to check in to see if they know the answer to help you out.
However, I would like to point out that checking the tags and the FAQ solves the problem about 90% of the time!! The answers to questions like 'Where can I read their J-web translations?' or 'Where can I download School Kakumei?' are easily found by using the tagging system and just browsing around here a bit. The FAQ handles a variety of things, like how to get tickets for Johnny's concerts, how to send fanletters, and the airing times of the various tv shows featuring JUMP members.
A lot of the scans have been compiled and organised by ssm_kiyumi and can be found here. Please check that page before requesting scans.
Also, take a look at the previous masterposts. Maybe your question is already answered there and if not maybe you see a question you know the answer to yourself. It's all about helping each other, right?