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I'll have a go.
A verb has five attributes:
Person (3) - 1, 2, or 3
Number (2) - singular, plural
Tense (7) - Present, Future, Future Perfect, Past Preterite, Perfect, Imperfect, Past Perfect
Mood (5) - Indicative, Interrogative, Subjunctive, Conditional, Imperative
Voice (2) - Active, Passive
This means that in theory a verb can take 3.2.7.5.2 variations, = 420 forms. In practice, there are not nearly as many because a lot of combinations do not exist.
My advice would be to visit a website which explains these attributes in English, which is remarkably similar to Spanish, except that the subjunctive mood is used much less. Once you have got the patterns identified in English, you can apply them to Spanish.
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