Tubeless tape is part of it.
it helps to make the rim air tight because of the spoke holes. However the rim bead is also really important. If the rim does not have a proper bead it will most likely not hold the tire properly. You could have anything from minor “burps” where the tire slips off the bead momentarily, all the way to full blown blow outs of the tire.
So, you need to find out if that rim is designed to run tubeless tires. If it is, get the proper sized tubeless rim tape, tape up the rim. Then get tubeless ready tires, sealant and tubeless valves.
Tubeless, when done correctly, is a far better set up than tubes.