Well yea whether online stores or you LFS - They make a living off of you buying as much as possible - So yea in their opinion you'd need everything and then some.
But that's real silly and IMO & experience also unnecessary and a waste of $.
There's a LOT of very beautiful plants for which you don't need no hardcore set up. Look at my 55g with the Red Tiger lotus (pic below) IMO one of the most beautiful tank plants and like I said I don't have all that high tech equipment neither.
Also plants like Swords, Anubias, Vallisneria, Cryptocoryne, Ludwigia, Rotala and Hygrophilia all grow just fine in lowe-medium light set up, getting a daylight for them will do just fine, add some liquid fert's and you'll be happy trust me.
Just googel pictures of the images and see how you like them, there's aquarstic plant stores online but I can't post you external links here (forum rules)
For the specialized plant substrate mentioned by Hawkin: This will only help plants that mainly feed off their roots, like Swords, it will not help the other plants too much, so IMO I'd safe the $ for it and rather buy a comprehensive liquid fert and IF you do get Swords just but them root tablets (Seachem's products are pretty good)
Well really you also gotta think, if you hook your tank up with THE most expensive light you can find and THE hardcore CO2 machinery - You may not have Budget left for nice fish and wind up with some lil Guppy or alike - I'd pers not wanna go set up a high tech tank and then add goldfish to it
On a side note, and that's a factor that should NOT be neglected by now means: If you have lower lights but Inject CO2 at a higher level (tank out of balance) that does encourage algae growth. Growing algae is EASY, getting rid of it not so much. And its proofed that algae is directly influenced by CO2, Light & Fert levels
I hadn't been able to find ANY stand I truly liked when setting up the new 55g, so I built my own and I'm LOVING it, not only does it look good IMO but its also sturdy enough to support2x55g on it (I figured I rather built overkill then the other way around not knowing a thing about carpentry lol)