you know that the walking foot is for straight lines? it's the best thing for keeping the fabric from pleating as you go. did you look for instructions on youtube? it's worth learning to use it. there's no substitute.
check this site. they show a video on whatever you click on. find the right foot and see how they use it.
http://www.sewingmachine-sales.co.uk...tch-guide.html
ooops! walking feet are not there, but hold on to this site for the future.