So here are my thoughts on free motion... I use no foot because I feel like the foot gets in the way - (I can't see where I'm going.) Also - I put the feed dogs down AND i put the presser foot all the way down - it helps give just the tiniest bit of stability so things don't run away from me.
Tissue paper is a good idea if you're using light weight fabric but I almost always use canvas so there's no need.
Most importantly...don't aim for perfection. It should be loose and fun and "doodley".
If you expect something architectural and precise you won't have any fun at all!!