so when I water should I make sure I drain the tray below my plant, I don't want it 'siting' in water correct.
Yes, you don't want the possibility of water wicking back up into the pot. A larger tray with a little more depth is often used as what is known as a 'humidity tray' This is usually used with an inch or so of gravel. This way you can keep water in the tray (below the top of the gravel) to raise the humidity in the area of the plant and not worry about the soil staying soggy.
I will get a larger tray of rocks and fill water up below them. (they look better then sand lol)
Chances are its in poor soil. I will wait until late winter/early spring to re-pot it (since our summer is over I assume its best to wait till then?) and I will order some bonsai soil.
From what I can tell I agree that the soil should probably be changed. Being a tropical Ficus are not as picky about the timing of re-potting as temperate trees so a healthy tree can be re-potted as necessary. Many growers do Ficus during the summer when they are in a period of active growth.
Do you think it will be okay until spring?
How much water is heavily I don't want to over do it, like 500ml/16oz? The reason I haven't done this is I'm afraid of it not draining properly due to poor soil.
Don't worry about using too much water at any one time. Proper watering for most species is not about quantity but frequency. Strife is correct about not keeping the soil soggy. The trick is to know when to water, not how much. Try using the Chopstick method until you get a feel for the requirements.
Chopstick method??? So I only water it when the top cm of soil is dry correct. Which does not seem to be very often now, id say once every 5 days?
Also I have been using a general plant fertilizer (drops) every 2nd watering, I cut the amount of fertilizer suggested on the label by 50% because I heard that bonsai are very defecate. Should I just use tap water or can I keep up with the fertilizer?
I fertilize at full strength about every 10 to 14 days. By full strength I mean mixed according to directions. Some growers do mix at half strength and apply more frequently feeling this is preferable. There is also some debate about organic Vs inorganic, both are effective and the most important thing is not to ignore this important aspect of bonsai.
Ill keep using fertalizer then thanks!
Pruning, should I just wait until I re-pot next early spring?
Again with Ficus they can be worked on with more flexibility than other species. The real question is what are you going to prune? Styling decisions must come first.
All I want to know is if I wait and it gets large and bushy I can still trim it and not have any negative effects, I'm not sure how I want to style it now. I was going to prune it then change the soil all at once, hopefully next spring?
It seems like I have enough light, thanks to that big window in the picture. I don't get very much direct sunlight though. Will I be ok?
Which direction does the window face? Ficus can do OK with lower light levels but will do better in stronger light. Are you intending to keep your tree inside permanently?
Yes I plan on keeping it inside, heat is included in my rent so during winter I tend to have the place fairly warm! The window faces North. I was going to put it up on my window sill with my other plants (see pic) but I'm worried the changing temprature near the window might do more harm then the light doing good. Since its fall during the morning and night it is cold and during the day it is warm.