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 Problem Statement

Hi all,
I am trying to calculate a two loop scalar integral for a project at university. I'm not entirely convinced I have set the problem up correctly so I am looking for a wise person to tell me if I've made any fundamental errors so far. Also if anyone is aware of any good literature for getting started with two loop Feynman integrals I would be very appreciative. Thanks in advance :)
 Relevant Equations

Internal propagators:
$$
P_1 = \dfrac{i}{k^2  m_1^2} $$\\
$$
P_2 = \dfrac{i}{(qk)^2  m_2^2} $$\\
$$
P_3 = \dfrac{i}{q^2  m_3^2} $$\\