For a while everything in life will remind you of her; maybe a song comes on your iTunes and you think of her, maybe you find something she left in your house, maybe a film you loved watching together comes on TV and you think about her. For a while you might not even want to go to certain restaurants or the cinema or certain cities because it was your thing to do together. It's going to take time and it's going to be utter wank for a while but eventually you'll think about them less and less till one day you wonder what it even feels like to miss that person. Concentrate on yourself, get out into the world and relax, reconnect with friends/families you might have strayed from.
And stay the absolute F away from social media. Block her on anything you have her on so you don't get tempted to go looking for something you don't want to see.
Good luck.