kinda hard to explain but i’m new…is there a video that could help me?? i’m making wool pants and i finished 1 leg but now i need to start the new leg but i have to start with a new string of yarn…does that make sense. the yarn isn’t attached anymore and i’m pretty sure that i don’t cast back on 
so i’m kinda confused can someone help me thanks so much
Just start knitting with the new strand, leave a tail long enough to weave in later, from 3-6". It will look loose for a row or 2 but won’t pull out.
You can fix any looseness or holes with the tail when the pants are done. 