Rear Derailleur Adjustment

Hi all,
First post and a total novice so please be gentle with me.....
In an attempt to lose some weight and have a little fun I have just bought a 2007 GT Avalanche 1.0 second hand but unused by the first owner, so the assembly/setup had not been tested. The bike came with no manual/owners handbook.
On my first ride using the middle front chainwheel and I think 3rd gear on the rear, the chain would snake from 3rd to 4th gear and back again. A quick twiddle of the cable adjuster at the handlebar end seemed to solve this but later on in the ride while doing my best to get my hugely overweight body up a climb the gear began to slip again.
So, can someone suggest the correct/best method of adjusting the rear derailleur please?
If anyone can suggest a download location for a manual/handbook for the bike I'd be very grateful as I'd like to know a bit about the forks as well. I've searched this and other sites but can't find any links to GT bike manuals.
Sorry for the long post,
Thanks for any and all help.
Ian.
First post and a total novice so please be gentle with me.....
In an attempt to lose some weight and have a little fun I have just bought a 2007 GT Avalanche 1.0 second hand but unused by the first owner, so the assembly/setup had not been tested. The bike came with no manual/owners handbook.
On my first ride using the middle front chainwheel and I think 3rd gear on the rear, the chain would snake from 3rd to 4th gear and back again. A quick twiddle of the cable adjuster at the handlebar end seemed to solve this but later on in the ride while doing my best to get my hugely overweight body up a climb the gear began to slip again.
So, can someone suggest the correct/best method of adjusting the rear derailleur please?
If anyone can suggest a download location for a manual/handbook for the bike I'd be very grateful as I'd like to know a bit about the forks as well. I've searched this and other sites but can't find any links to GT bike manuals.
Sorry for the long post,
Thanks for any and all help.
Ian.
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Parktools :?:SheldonBrown
Thanks for taking the time to reply.
Ian.