Extruding within a selection with the sculpting tools

Hello people.
I would like to model a simple character face and had the idea that the most simple method would be to extrude facial features using the sculpting tools within a defined selection on the face mesh.
Is there some way that i can select an area within a mesh and extrude within the selection using the sculpting tools? it seems like something which certainly should exists but i dont know how to do it as i am very new to this game. Thanks in advance for any reply’s.
Danny

When you get the brush tool, you can specify how big/ small u need the extrusion/ deformation to be. Simply press f while having the cursor on the model and drag in and out to get the size u need. and then click and drag on the mesh.

Select different brush settings by clicking on brush profiles to drag/ pull/ push the mesh.