You are on the right track. There are two main ways to get to Victorville and it is somewhat dependent upon where you live in the SFV. You could take CA-14 to the Sierra/Pearblossom Highway known as CA-138 and then onto CA-18 (AKA Palmdale Road) and that takes you right into Victorville. Most people nowadays no longer take the I-10 Freeway, but they get onto the I-210 Freeway and that now takes you to the I-15 and just over the El Cajon Pass is Victorville. This is the new front way to Victorville.
Once on 14, take exit 30 for Angeles Forest Hwy toward Pearblossom Hwy.Keep left at the fork to continue toward Sierra Hwy and merge onto Sierra Hwy. Continue 4 miles onto Pearblossom Hwy (138). Turn left at CA-18 E/Pearblossom Hwy. Continue to follow CA-18 E all the way to 15.