Okay, lets start with the table, since I not too long ago helped my neighbor clean up a fallen tank on an emergent basis, because the desk he had it sitting on suddenly gave way. There was broken glass fish and fry everywhere!
A tank that size needs a stand that is sitting on the floor, no "legs" unless the stand is made of wrought iron and is made for fish tanks. So a bureau that is solid wood with center supports and a solid frame might work, but you need to be very sure.
Substrate is gravel or sand or whatever you want on the bottom. I recommend a canister filter, but there are
HOB filters (hang-on-back) that could work for that tank as well. Go to bigalsonline.com and check out all of the options there. Gouramis are great but often they don't do so well together, but that depends, so we'll have to narrow that down. Consider doing a fishless cycle while you choose your fish, as it will give you time to make the best choice.
Here's my favorite link discussing fishless cycling:
http://www.tomgriffin.com/aquamag/cycle2.html
I need to get myself off for some shuteye, but you'll get plenty of help here, every step of the way! I don't get up to the Shore much anymore, so color me jealous!