First you need to ask yourself (and tell us) "How involved do I want to be in this tank?", "How much money do I want to spend?" and "What is my goal?".
Basically I see planted tanks in 2 realms, high tech, and low tech. There is some amount of grey area here, but it is sort of like saying "a suffusion of yellow", what ever you choose to do with it, its still yellow.
High tech:
Pressurized CO2 injection, you can use DIY (yeast method) but that is hard to get stable, and you really want to maintain CO2 at 30 PPM. To do this properly you should have a PH monitor and that won't work with the yeast method.
Liquid fert dosing: the more often the better, you would dose N,P,K,Fe, and trace, I recommend at least twice per week. How much is related to how much your tank uses, this will take a little getting used to. Phosphate and Nitrate are easy to dose, because you can test for them, but Trace, Iron and Potassium there is no reliable test kit for so they are kinda by feel.
Lots of light: Usually around 3-5 WPG, but that is a ruff guide, over your tank (assuming it is four foot long) I would think that 4*55W PC's would be fine provided they are in
parabolic reflectors such as the ones sold at AHsupply, this makes a big difference. You want 5500-6700K light BTW (don't worry it doesn't look yellow in FW).
Substrate: The only thing I would even think about for a tank like this is Florite, Eco-Complete, or the Aqua Design Ammano substrates, but this can get expensave fast, so shop around.
Water changes: 50% or more weekly.
Low tech I played with high tech for a while, but I personally like this approach better, much more laied back, and it's how my 180 is setup.
CO2: None, or if you want an yeast CO2 setup, you don't need too much.
Ferts: None, see substrate.
Light: for your tank (assuming it is four foot long) the perfect thing is 3 or 4 NO 40W tubes. You can buy a shoplight at with a ballast that runs 2 bulbs for $12, the lamps will run you about $5 each and HD carries a bunch of bulbs that suit your needs, 5500K, 6200K, Grow LUX (I like those, but coming them with some others) ect. You will change these about every 9 months.
Substrate: Here's where the cost really drops, you want to use potting soil (1 inch) under a 1 inch layer of 2-4MM gravel. Potting soil is by far the best substrate I have ever used, and the cheaper the soil the better, you don't want anything like Miracle grow that is pre-fertilized for a number of reasons, just plain old store brand potting soil. (but do the cup test before use)
Water changes: The only problem with potting soil is that in the first 4 months or so it will yellow your water, really bad in the beginning, and it slows down with time. So you will want to do a few water changes the first week of about 50% then taper off as time goes on just to keep the water clear. Carbon will also help, some people once the soil calms down, don't do changes for months on end.
If you want to do a Low tech tank, I highly recommend Diana Walstad's book, "The ecology of a planted aquarium" it is by far the most informative book on the subject I have ever read, and you will get allot from it.
That is a basic overview, answer the 3 questions, and we can start getting to details
HTH,
Whiskey