I'm kinda diy'ing a lot of what i do. but i can get you started.
the light fixture you posted is good. will adapt well to your tank and not take up much space. you just need to replace the colormax bulb with another plant bulb.
it uses T5 bulbs so make sure you get another compatible T5 bulb.that will give you about 1.5 watts per gallon and with a short tank like yours, it should work well.
also, i would consider CO2. Doing it diy is pretty cheap, but it takes some doing and changing out the yeast slurries every week gets to be a pain. or doing pressurized once you see what CO2 can do. at which point you might want another one of those lights on top to turn the tank into a monster. sorry, i'm going off onto a rant.
you can get plants in many places online. if the weather is cold were you are, you're gonna want to pay the extra for overnight shipping and cold protection. if it's warm where you are, look on some of the forums for local hobbyists that can set you up with a ton of stem type plants for cheap. i've only had good experiences in that respect. but fill the tank with a lot of fast growing stuff at first to really get things going.
I'll pm an address online to get good ferts that take a little doing to use. but what you would want to start with is this....
KNO3 = Potassium Nitrate
MKP = Mono Potassium Phosphate
GH Builder = contains gh through calcium, magnesium, and potassium.
Plantex = trace minerals
Chelated Iron = Iron source
that stuff in the raw costs about $30 for a year's worth. much cheaper than commercially available stuff.
Without CO2, you will want a carbon source like Fourish Excel. it'll help things get growing with the ferts. get that at any of the big online pet box stores.
get your self set with all this stuff and we'll talk more about dosing schedule and all that. and read. read as much as you can about the plants you want, CO2, dosing plans (EI), lighting, etc. it's a lot to swallow, but you need to have a pretty working knowledge of what's going on in the tank.