Even though many citrus will grow true from seed it can take many years for them to bloom and some will never flower but they do make a nice looking plant. It's best to buy a grafted dwarf tree. I don't know about a regular citron but have found the Buddha's Hand to be one of the more difficult to get fruit to mature. I finally gave mine away after 4 years of losing 2" fruit. Citrus are fairly easy to keep in pots. I keep mine outside during the warm months and in a cool greenhouse during the winter but they'd probably be fine inside. They do need a period of cooler (not freezing) temps in the winter to set buds. I think that Four Winds is one of the best citrus nurseries and have bought several trees from them.

Here is a link that might be useful: Four Winds