Learning verbs - which tenses to learn first?

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This is really my first serious post here, so go easy with me ;-)
I am currently cramming on the verb front, amongst other bits and pieces before I go out to Poland in July. What would be the best way to do this........just learn the present tenses of the more common ones (quicker with more covered) OR the past, present and future tenses of the most common ones (slower)? I figure I would have to learn those in time anyway, but I also need as much as i can get into my Homer Simpson type brain. Thoughts?

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Well, the present tense is probably the way to go.
If you add proper words/expressions stating the moment in time, people should understand you somehow.
Just immagine:
Next year I go to Poland. Last year I visit France. Yesterday my fiancee cries. - With a minimum of good will people should get the correct info (referring to the past or to the future), both in English and Polish.

I'd say present tense is the easiest way to start, if you have to cram it in in such a short time. As long as you use some kind of reference to time (you don't have to have the exact conjugation of a verb in the past tense for people to know what your talking about), everything will be okay:) From my experience, and I think alot of people would agree-start with learning the most common verbs, ex: być,chcieć, wieć. Powodzenia!

Thank you for your prompt replies, really appreciated ;-)

I agree, learning the present tenses would see me cover more material , I can always add the others at a later date.

As a matter of interest and given everyone is different, how many a day would you think would be reasonable to try and master?

The present forms of verbs aren't hard to learn at all-its all basically a matter of usage. When you speak English or hear other people, try to think of how it would sound in Polish. I used to try to learn 5 or 6 verbs a day, good luck!