There are a lot of rules in electional astrology, but the most important thing to remember is that there is no such thing as a perfect chart. In fact, trying to select a perfectly auspicious chart can be so exhausting that it’s better to simply get started on whatever you are planning to do and then work through the difficulties as they come up.
To start, you want to pick a chart where the planets that signify the subject of your endeavor are well-placed and in good condition. For example, if you’re going to ask someone for a loan, you’ll want to see a connection between the 8th house (other people’s money) and the 1st or 2nd houses (your money and personal possessions). The Moon, the significator of this question, should also be in a good position in the chart.
Also, you want to minimize the malefics, especially Saturn and Mars. This is easiest to do by ensuring that they’re not in hard aspects with the Moon and the rulers of your natal chart, and by emphasizing benefics such as Jupiter in Day charts or Venus in Night charts. Also, try to emphasize planetary placements in the angular houses, especially whole-sign houses for topics and quadrant houses for activity.
And finally, make sure you have lots of trine and sextile connections between the planetary groups in your chart. Trines and sextiles are the most positive aspect to have, as they indicate harmony and ease.