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Calculating pH and calculating concentrations from pH

I'm struggling with working out pH's when you get a question such as this:
"Calculate the pH (to 2dp) of the following acid;
0.004moldm-3 NaHSO4, Ka of HSO4-= 1.00 x 10-2 moldm-3"

I'm also struggling to work out pH's from concentrations with questions such as:
"Calculate the concentration of the following acids given their pH;
CH3COOH, pH 3.40 Ka 1.7 x10-5 moldm-3"

When working out the pH for different acids/bases i.e weak acid, weak base, I know there are different formulas, what are the formulas for each one?

Thanks in advance! G

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