re: ch- space ?

dc ,ch2,dc in nextch-2,ch-1, skipch-1, sc in next ch1 sp

You may have left out some terms that are important. I will assume it should read like this:
dc, ch 2, dc in next ch-2 sp, ch 1, skip ch-1 sp, sc in next ch-1 sp

translation: work a double-crochet (dc), chain 2, work a double-crochet (dc) in the next chain-2 space [that is, the space created by a "chain 2" from the previous row/round], chain 1, skip the next chain-1 space [that is, the space created by a "chain 1" from the previous row/round], single crochet (sc) in the next chain-1 space [that is, the space created by a "chain 1" from the previous row/round]

NOTES:
1. Expressions such as "ch-1 sp" or "ch-2 sp" are DESCRIPTIONS of what is already there, NOT an action you need to take. "sp" is the abbreviation for "space". The first part describes the space in terms of the chains of the previous row/round that formed the space. So...
"ch-1 sp" is a space created by a "chain 1";
"ch-2 sp" is a space created by a "chain 2";
"ch-3 sp" is a space created by a "chain 3";
and so on.

2. When instructions tell you to work stitches in a space, insert your hook into the space (hole) itself, not into the chains that created the space. (When you work the new stitches, the yarn will wrap around the chain from the previous row/round.)

If a photo might help, go to http://crochet.about.com/od/learnbasics/ss/basictsq_3.htm and study the captions on the illustration.