Use your measurements to purchase the correct size pattern. Use your high bust measurement for most patterns(tops and jackets). You primarily want shoulders and armhole to fit and you can make bust adjustments. For bottoms, use your hip meausurement to figure out what size. Waist can be easily adjusted.
Next, rough cut your pattern pieces. Place them against your body and look in the mirror. Does it look like it will fit.? Using a marker - outline what you think would be a good fit,keeping in mind how much ease you want. Once you have it somewhat figured out then you can highlight the lines which work best for you and remember to include your seam allowances. You may blend in and out of different sizes. This will increase your chances of making a garment that actually fits. I start with the front pattern piece. Keep in mind that pattern pieces must coordinate. So things like your front side seam must match up with your back side seam. Make a test out garment and then make corrections and transfer that info to your pattern. Try again.
Sometimes it may take making a couple of test outs, but that's what that fabric you now think is ugly ,is for.
There are other ways of fitting but I think this one is easier than most. Fitting skills are developed and as you continue to sew you will increase your ability. Develop an eye for good fit. Look at how others dress and figure out what works and what doesn't. Clothes that are too big, hang way off the shoulder, look sloppy. Usually, a more fitted armhole looks more appealing and is slimming. Notice the little things and it will help you understand fitting better and serve as a guide.