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Typically, you want a wider pot than tall. There are some general rules. The container should be shallow enough to restrict root growth but wide enough to support stability. Generally, for width, the pot should be about 2/3 the height of the tree, and the depth should match the trunk's thickness at its base. In this case, I would go with the size trunk that you will want, ultimately. Drainage holes are essential, and for flowering species, unglazed pots are often recommended to balance moisture retention.

This article will help with the care:

https://www.gardeningknowhow.com/houseplants/bonsai/first-bonsai.htm