I am relatively new to D&D but am attempting to DM in a couple of days' time. I am introducing friends (also new to D&D) with the adventure *Lost Mine of Phandelver*. 

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>  During the "Goblin Trail" section there is "a trail hidden behind thickets on the north side of the road leading northwest. A character who succeeds on a DC 10 Wisdom (Survival) check recognizes..."
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As far as I am aware a DC 10 Wisdom (survival) check entails a character to roll a 1d20 and add their Wisdom (survival) modifier to the outcome. 

So my question is:
Do I ask all characters to make a Wisdom (survival) check when they are approaching the hidden trail or do I wait until a player asks to investigate further and then ask them to make the check?