Whatever you need to talk about, if I'll do, I'll give you my wholehearted attention.
Literal
Any-kind consultation [to-にも], I [if-で-良ければ] with-one's-whole-heart answer-[volitional-ましょう].
どんな~にも 'whatever kind of X' is the universal quantifier form. 私で良ければ is a humble offer frame 'if (it's the case that) I'll do / if I'm good enough.' 親身になって (literally 'becoming close family') is an idiom for 'with genuine, wholehearted concern' — as if caring for a family member. ~ましょう is the polite volitional, here used as an offer to the listener.