It's a routine to be taken. Here's what you need to do:
For oily leather models: just apply a renovating oil (we sell them in our shoe shop section). It will waterproof, deeply nourish and revive the colour. Little tip: rather place the oil on a cloth before applying it to the shoe. You can then polish with a shine brush.
And don't forget to use shoe tree when you're not wearing them, essential for maintaining the shape of your shoes.
We have everything we need in our cobbling department at reasonable prices, so don't hesitate.