Had oil leaking,now vehicle won't start. what could be the cause?

What is your question?

I was driving down the road when I lost power from engine. when I pulled over I had smoke under hood, upon inspecting, I noticed I had oil all over the cross member under the engine. the engine would run rough, but when you pushed the gas pedal it would lose power and start trying to stall out. now engine won't start, any ideas where or what I should check first. I really need it running and a full fledged mechanic is well outside of my budget. can do the work myself, just need pointed in the right direction. thanks in advance p.s. this is the 2.7 XL7 not the 2.5 model Vitaras.