SOS Help

I was leaving for work last night, and the car just shut down and would not restart. I was going to the gas station fuel was low but it wasn't empty. I can hear the fuel pump come on when I try to start it. I found some corrosion on the battery terminal, cleaned it off still won't start. Put the battery on the charger will see what happens. Did a visual inspection of the engine compartment didn't see anything unusual. I have to find a code puller to see whats happening. What do we have OBD1 or OBD 11. Any idea how much these cost?

What should I try next?

It turns over, I haven't checked for spark yet cause the battery is still charging. I had corrosion on the terminal awhile back and that did prevent the car from accepting a jump and starting up. So I'm gonna check that first then jump to spark plugs, cap, coil etc....

I'll do a tune up while I'm at this, what brand of spark plugs should I get?