Alright, let's divide this into two parts -- the important part though is that these two sets of instructions are going to be happening at the same time, one on the side edge and one on the center front edge.
Shape side and front edge: Dec 1 st at front edge on next 26 rows and then every foll alt row and.....
You are going to decrease one stitch at the front edge every row for 26 rows and then every other row (every foll alt row). Since this is the left front piece (left, as worn), the front edge is at the end of your right side rows, or the beginning of your wrong side rows. It is good to place a decrease at least one stitch in from the edge. It makes the edges neater and helps with any seaming or picking up stitches later. So for each of these front edge decreases, for right side rows I would work until you are 3 stitches left, then K2tog, then K1. On the purl rows you will work the decrease at the beginning of the row, again placing it one stitch in from the very edge, so you would P1, P2tog, then continue on the rest of the rows instructions.
AT THE SAME TIME shape side edge by inc 1 st at side edge on 3rd row and 10 foll 4th rows as on back at 55 sts. Keeping front edge dec correct every alt row and keeping side edge straight, work 7 rows in st st ending with a WS row ( 50 sts worked) (51 sts) !!!!!!
This set of instructions for the side edge increases will also begin at the very beginning, right after casting on. You will start your increases on the 3rd row and then the 10 following 4th rows, increasing one stitch at the side edge - this will be the beginning of right side rows. So you will increase one stitch at the beginning of row 3, and then 10 4th rows, that's a total of 11 increases which will land on rows 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43. You can use a kfb or increase for these, which won't be totally invisible but is a good all purpose increase. Or, you can do a M1L (left leaning) increase which you will find a video for in the basic techniques tab. Again, place the increases one stitch in from the edge.
Once you have finished those side edge increases, you will still be doing the front edge decreases every alternate row (from the first set of instructions we talked about) and without doing any more side edge increases you will work 7 rows in stockinette stitch, the last row worked will be a wrong side row, and you should have worked 50 rows and have 51 stitches left.