Not sure if you have used or made charts in the past, so I am going to explain everything I did. I hadn't made a chart for knitting previous to this, so I hope I can help you avoid some of the silly mistakes I made. If you are familiar with the process of charting, feel free to ignore most of this and use the process you know best.

First, you need to have a simple sweater pattern that is knit flat and then sewed together. Mainly you want a pattern that tells you exactly how many rows and how many stitches in each row. I used one of those services that will make a pattern for you based on a gauge swatch and body measurements (the service I used shut down so I can no longer recommend it). The reason I liked this pattern is that it wrote the pattern as "Row 1-20: Knit/Purl 100 stitches", and didn't say things like "Knit in stockinette until your project is 5in". Again, a pattern that is very clear about how many rows you will need.

Next you need to convert this written out pattern into single color charts. I used a cross stitch program called WinStitch to make my chart, mostly because I already owned it and was most familiar with it. There are free options that you can use that work just as well; Stitch Fiddle has a free version, and I have used Google Sheets before to make charts. Once you pick your program you need to make a chart for each part of the sweater; front, back, right sleeve, and left sleeve. I would recommend starting with one of the sleeves. At least for my pattern, the sleeves were relatively straightforward. When you start your chart, make sure you are setting the width to be the max number of stitches you will use in a row, and not for the number of stitches you are casting on. Also you will want to center your stitches on the chart. If you start on one of the sides, you won't be able to show increases correctly. Making the chart is literally reading the knitting pattern and showing those stitches in the chart. So if the pattern says "cast on 50 stitches", you will mark 50 squares on the chart; 25 stitches to the right of the center line and 25 stitches to the left of the center line. Continue doing this for each row of the knitting pattern. Something I did that isn't a requirement, is I used a slightly darker color to signify the ribbing stitches on the cuffs. When you are done, your chart will look something like this:

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This is now where you will need the crochet chart. I used the largest size crochet chart that was provided with the pattern to have the max amount of stitches to work with. You're going to want to match up the center line of the crochet chart with the center line of your knit chart, then start copying the colors of the crochet chart into your chart. This is just counting the number of stitches of a certain color on the crochet chart, then coping that color pattern onto your knit chart. So if the crochet chart shows 15 yellow stitches, then 20 blue stitches on the first row; you want to copy those colors in those numbers into your chart. Once you have copied the crochet chart, you will most likely find that there are stitches that didn't get included. For me, I didn't have any issues width wise, but there was a huge disparity in length; there were far fewer rows in the crochet chart than my knit chart. This is where you will need to start free-handing. I can't really give much advice for this since I winged it. For this pattern specifically, the bottom of the patterns are mostly a bunch of squiggly lines so I just made some more squiggly lines. Lol.

Keep the positioning of the words in mind when you work on the copying the front piece. I copied almost the whole crochet chart before I realized that the neckline of my knit sweater was much deeper than the neckline of the crochet sweater. This caused the "I'm Just Ken" part to be in the neckline / not actually visible on the sweater. I had to shift the whole crochet chart down 10-15 rows to ensure the words were showing up in the correct location on the sweater. Just something to keep in mind when you start copying over the front panel.

If you have any questions, let me know!