Hi Tony!
Happy to see the Swedish BTS-scene expanding further! I hope you’ve heard about BizTalk User Group Sweden – BUGS – http://biztalkusergroup.se/default.aspx
First Question: In short, whenever you’d like to manipulate/read/validate the data of your message you will need to create schemas. So just passing the message from A to B there’s no need for schemas. If you as well would like to reformat the message (map message) into another message-type, schemas are needed.
Second Question: Mostly, a BizTalk developer (at least this is true for me) uses Visual Studio (schema/map creation tools) and the BizTalk Server Administration Tool (setting up ports/subscriptions etc).
Regards! //Niklas Häggström – Connecta AB, Stockholm, Sweden