Newbie needs help.

I need some advice on setting up an tank I just got. My sister gave me old her 90 gallon tank for Christmas and there is a lot to do to set it up. First of all the thing needs a good cleaning, it was used with salt water and it has buildups all over. Does anyone know a easy way to clean all the salt deposits off the glass and plastic?

I plan on going no co2 with this tank as I am thinking it is not as costly as co2, big factor for me. So what is a good amount of light? The old lights are way to small, 30W total, so I am thinking of upgrading to 2 55w pc for a total of 110W, is this about right? By the way, after measuring the inside of the tank I calculated it is actually 79 gallons empty.

Now for what confuses me the most, the substrate. I have read and read about substrates and just seem to get more confused. Seems like a lot of different ways and I would prefer to avoid the trial and error method. So what is a good substrate for a beginner to use that will not break the bank and does anyone know of a source in the Tacoma/Seattle WA area for it so I don't have to ship it?

Any advice or info would be greatly appreciated. So far I only have limited experiance with a 10 gallon so my learning curve is quite steep.