Technically, you don't really "need" anything other than a knife or razor, small cups (dollar store) and water. No dome, just put them under CFL (s) , and mist the leaves as often as possible. Many will die, but when you roll ghetto like I do, just the name of the game. you can get a box with the top missing and surran wrap that shit over, so light gets through and moisture stays in. and mist as often as possible again, but you will get takers without doing much more than just putting in a cup of aqua and crossing your fingers lol.
Cut I would say about 4 or more inches down from what will be the top of your clone (basically just a shoot) it will probably have two to 5 leaves hanging off, trim about 50% of the leaf mass off the ends. DO NOT be cutting this shit off severing the main stem, or your basically topping the plant, and cant see a reason why you would do that while its in flower, lol. trim any foliage that will be under the water line in the cup.
IF you follow that, you should have at least a few that live, but its going to take them about 2 months to make much progress... Once they root, put them in your medium, they will go through a weird ass retarded looking stage re-vegging. mutant leaves, once your foliage is growing normally again, and does not look like an abortion, then its safe whenever you are ready, to put the plant back to flowering stage. BUT if i where you i would grow these clones out a bit in veg, take cuttings from them to clone WHILE STILL IN veg (much faster), then once you notice you have adequate amount of healthy clones from those that look like they will survive, throw your original clones (the now much larger plants) into flower, and presto, you have mastered perpetual growing, with no need for seed.