hehe yaaaay!
congrats!!
hows it goooinn? long time no see haha

Of course I could give you tips ^^ But I have to tell you that my English is SO crappy because I'm French... so if you have some questions, don't be afraid to ask me! I hope it will be clear anyway.

So first of all, choose a good picture that you like. What I mean by good is: high quality, nice luminosity, BIG, clear, not blurry, etc. And you have to like it because you'll spend a lot of time on it, hehe!
Second, you'll need some material: Sketch paper or drawing paper,H, HB and B pencils (I personally use Staedler Mars Lumographs) and a good eraser.
You also have to know that realistic art is also "observation" art... You have to check your picture like... every 3 second. You can't draw without looking at it at all. You have to look at it while you're drawing.

Start by the LINEART with your 4H pencil (it has to be PALE): draw the face, the eyes, the nose, the mouth, the hair, etc. It will only help you, there's no details, only sketchy smudges.
Then you can start to put tones and shadings with your H, then your HB pencil. You can use a tissue paper to stump... Sorry if it's not clear, it would be easier if I could be next to you! Don't worry, I'll give you some links to help you!

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Here you are ^^ So... If you have questions or anything else, ask me! I hope it will help you XD And sorry for my bad english.