During your training be sure to master running not only on solid floors but on grass, mud and the shifting walls of gravel quarries. It is also vitally important that you practice running on metal grills. You will probably have to do this above the flaming heart of an exploding spaceship – getting a heel caught could be disastrous.
In case you hadn’t gathered from all that running in stilettos, you’re going to need to get very fit. All companions are in peak physical condition. The Doctor needs them that way. For the running. It’s also a good idea to perfect a style of running that doesn’t make you look like a demented sea bird. Try for grace and elegance, even when going full pelt. You may also need to hold onto small ledges for dear life, so don’t neglect upper body strength.
Now, your life is going to need to be boring. It is a harsh but unavoidable truth that if you have an interesting and satisfying job your chances are severely diminished. The same goes for a perfect family and/or social life. If you’ve got a lot going on, there’s a chance that, when it comes down to it, you won’t really want to leave and risk missing out on the real world. Luckily, given your punishing training regime, you probably don’t have time to see your loved ones anyway. Good. Keep that up.
You’re going to need amazing hair. Apart from granting you general success in life, great hair is a must if you want to be a companion. It’s also worth noting that you may have to run out the door at any given moment, into any given decade, so lengthily beauty routines are out. Learn to look fabulous in record time.
On that note – buy a dressing gown. You won’t know where, you won’t know when. A dressing gown will help you achieve an attractively dishevelled look in the wee early hours if necessary. If he does rock up at 1am, you won’t have time to get changed.
Now wait. And listen.