You could go for a ratio of 3-1-2 or thereabouts, that's a kind of general use ratio (that's ratio not analysis, so that would mean an analysis something like 6-2-4, 15-5-10 etc..). Consider also that you can provide the same amount of nutrients with 3-1-2, 6-2-4 or 30-10-20 by just changing the amount applied, so the analysis isn't the only consideration.
This is a kind of "generic" answer without knowing your soil or its natural nutrient content. If you don't find it too expensive, I would go with slow release fertilizer so that you don't need to keep applying it. If you can it would be better to get a soil test because then you can match your fertilizer analysis to that and hopefully avoid applying too much of one thing and too little of another. Do you have any kind of ministry of agriculture there that provides information to gardeners and does soil testing? They would be more familiar with your local conditions and soils.
