|This blue tape contrasts nicely, for better vision.|
My favorite way to mark is with masking tape. I'm not particular what kind of tape I use, just about the contrast. I do have one very important rule:
NEVER leave the tape on over night!
I prefer to stitch right next to the tape. I think I get a straighter line, and if I miss, I don't mind using a pair of tweezers and picking out the bits.
Others prefer to place the walking foot next to the tape.
Which ever works for you is the right one! Try them both, it's fun!