Beginners to golf do not need to go and get a custom fitting on their clubs, but if you have the money and want to go all in on your new hobby then we won't stop you. Really the main measurement you want to get right when buying is proper club sizing (not too tall or too short), and the good news is most of these clubs will have a solid fit for just starting out.
The only initial adjustments you need to make as a beginner is if you are tall or short. If you are over 6'2", consider sizing a half-inch or more length adjustment on your clubs. You can also just opt for a set that has a "Tall" set available. If you are under 5'5", you'll likely want a half-inch decrease in length adjustment.
If you like to go by feel, swinging your friends clubs or talking to a pro at your local course will help confirm the sizing you need. As you progress in your game sizing can be pinpointed down further to personalized club sizing, if you choose.