I just started growing indoors I have a meyer lemon tree and some strawberries. From the information I've gathered, you want an area facing south for the plants because citrus like a lot of sunlight. If you don't have a south facing window (like me), you can use fluorescent lights. I have one daylight fluorescent bulb (CFL) that I turn on in the morning and leave on for 12-14hrs a day. My tree seems to be ok with this, it has started to grow new leaves and it hasn't lost any leaves even after I repotted.

I have also read that citrus like some humidity and indoors does not offer enough humidity. One way to fix this is to put pebbles in a tray, add water but not enough to cover the rocks completely, and put the potted tree on top. This also acts as my drip tray. I'm not sure how true the humidity thing is though because I know there are some who grow in desert areas like Arizona but better safe than sorry.

Another thing you might want to think about is the potting mix and pot. There are two types a lot of people on this forum use - 511 and gritty mix. When I got my lemon tree, the soil that came in the pot stayed wet for 2 weeks without me watering and there were bugs in the soil signifying that there was fungus and decaying matter. I made some gritty mix and repotted my lemon tree because I was worried that the roots might rot if I left it too long. The link below explains a whole lot about container soils.

This is my just my experience so far as I am still just starting out but I hope you have some information to start with. There is a wealth of information on these forums :) I recommend you get to reading.

Here is a link that might be useful: Container Soils - Water Movement and Retention