Well, first off, you should get your tank cycled again before you buy an axolotl. Do a google search and figure out the best way to go about it, there are a few different ways to cycle a tank.
An axolotl's tank should be kept at 18-20C, though it could go a bit higher in the Summer without harming them.
If you plan on getting live plants, the best ones to use are anubias and crypts.
If you can, start a worm farm. Earthworms are a very large staple in an axolotl's diet.
Keep in mind that you CANNOT get any other fish species to live alongside your axolotls. It never turns out well.
Axolotls CANNOT, I repeat CANNOT be kept on gravel. The best substrates to use are pool sand, slate rock, or just keeping it bare bottom.
Remember to have at least one hide per axolotl. As axolotls don't have eyelids, when they sleep they prefer to be in dark areas.
If you have a waterfall-type filter, try to place plants or other decorations around the outflow, and keep the filter speed on low to medium. Axolotls don't like currents, it stresses them out.
Have some non-iodized salt on hand, as well as a quarantine tank. In the event you have a fungal infection on your hands, these are essentials.
You'll need a kit to test the water parameters as well. Liquid test kits are more accurate.
Have some other foods on hand as well. Axolotls enjoy blood worms, night crawlers, prawns, on small occasions they will also eat pieces of beef. Pellets also work well, the best being salmon or shrimp sinking pellets. You can also feed them small live fish such as minnows or feeder fish. Keep in mind that if you feed them live fish, don't let the fish sit in the tank for too long. They tend to nibble on an axolotl's gills and this stresses them out.
