Phone SARTU and ask for any course notes before you head down. Get hold of some Support helicopter SOPs and get confident and conversant with voice marshalling and all the standard terms and phrases (SAR have a few of there own)
Visit the SAR guys down the road from you as Lossiemouth and speak to them. Ask them what to expect (i have a mate that has not long left SARTU and is at Lossie now.) They will be more than happy to help and show off what the world of SAR is all about. The guys there might have course notes etc. If you can get on a training trip with them, brilliant, this will give you a massive insight as too what SARTU is all about.
The biggest problem for guys who come from a non-rotary background is having to adjust to operating a helicopter as well as the SAR aspect. Speak to as many guys from the SAR world as you can. You could even try DHFS at Shawbury for some hints and tips or even a look see for a day or 2 on your way too valley.
Hope this helps.