Tools. Pencils and erasers. Pens if you are braver than me. I have good drawing pencils, plain old # 2 pencils, colored pencils, charcoals, and some interesting and somewhat daunting drawing pens. Basically I find I like a plain pencil. I usually use a #2 pencil and a separate eraser. A white eraser. Always a white one because I've had bad experiences with colored erasers leaving their own color on the page. And it seems to stick worse then whatever I've tried to remove with it. That's not good. Because I get bored pretty easily, I often vary my tools. If I tire of a #2 pencil, a harder lead gives finer lines. I actually like the results better. Smudge sticks or burnishing tools help with shading if you like that look. I was using them a lot for awhile, but now I prefer the side of my pinkie finger if I want to blend something. And usually I don't use anything now. But, one of these days I'll probably go back to experimenting with smudging.
The finer the tool, the tighter the drawing. That's they way it works for me. If I want a really loose drawing, then charcoal or paints or crayons work best. For tighter drawings, the pencil is the answer. The harder the lead, the sharper the lines will be.
Where do you start with the face? Oddly, this is an old habit I picked up in kindergarden during World War 2. Someone showed me a picture of Veronica Lake and I was totally enamored of her cheekbone. I still notice cheekbones and planes of faces. My tendency is to start with a cheekbone, drawing downward to the chin and up the other side to the temple. Then to find where the top of the head should be. I draw a light vertical line between head and temple with a slight curve depending on the angle of the face. Next is placement of mouth, nose and eyes. Horizontal lines across the face at the proper angle help me.
From here I suggest you go to a video or book. They can help you so much more than I can. I'm still learning. Northlight Books has a number of good workshops that are downloadable. Watch for their sales too. Get on their mailing list to get the best prices periodically. Interweave also has workshops at good prices, but they seem to feature more of the pretty girl kind of faces that are so popular. Not everyone is a pretty girl. You may want to draw pretty faces forever and if so, there are dozens of videos on you tube you can study. If you want to stretch a bit farther and draw or paint mens faces, or older faces, or children's faces - I'd recommend the Northlight Books. Dick Blick and other art supply companies may have videos that will be helpful.
I recommend you get a sketchbook, a pencil and eraser and just start. Practice eyes on one page, mouths on another, noses? Ears? Then be brave and try to put them together.
Now, here is a fun twist for you. Get a fashion magazine and cut out some eyes and some eyeglasses. I keep a few of them in an envelope inside my art journal. That way if I'm disgusted with the eyes I just drew, I can view it with sunglasses to see what else needs work. LOL Sometimes we focus on one thing so long, we don't see the rest.
Sometimes we just need a little giggle.