Almond, Prunus dulcis (aka Prunus amygdalus) is in the subgenus Amygdalus along with culinary peach and culinary nectarine, which it vegetatively resembles. As bonsai the leaves do not reduce well, and internodes tend to be long, though can be kept moderate. Most used for bonsai are old orchard trees that have been dug up for bonsai, not normally raised from seed for bonsai. These orchard harvested trees are usually used to make medium to tall bonsai, mainly to show off the beautiful spring flowers. The rest of the year it has little to recommend it beyond character you can wire into its shape.
Full sun or near full sun, and you should get back budding at least until bark develops on the lower trunk. Maybe 8 weeks after it leafs out in spring, do your hard prune, eliminate all terminal growing points. This release of hormones should stimulate back budding, if not the current, possibly the following year. The tree needs to be vigorously growing in order for this technique to work. A weak tree won't back bud.
If you want almonds for fruit hanging in the tree in autumn for bonsai display, you will need another almond from a different seed. The almond tree is not self fertile. Like certain cherries, almonds require outcrossing to produce seed.
