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You can probably put trade off for a bit if you colonize around africa and take a province in India, you get a decision to found the east indian trade company, which gives you some trade power and a merchant. I usually go military ideas second, since it's about the time you get ahead of tech, and it makes a good place to spend points. If you are less concerned with colonizing, and want to conquer stuff in Europe, you'll want a military idea next. As spain, you don't usually need much from the religious tree you're probably not going to be doing much in europe to need the relations over time, and your national ideas give you +3% missionary strength and an extra missionary. If you want to start pushing into northern africa, then maybe religion is a good next idea, but northern africa is a bit of a pit, and I recommend avoiding it. Normally I would recommend interleaving groups, but for such a strong colonization start, expansion is definitely a good choice.
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