If the juice is concentrated, like molasses it'll be fine. Hops might be ok if they're vacuum sealed and freeze dried as they often are.. they look like little pellets. If they're just dried then get some more.
Just follow the instructions.
If you're bottle conditioning, (adding a bit of sugar in the bottle to carbonate) I would recommend using plastic coke bottles. They're pressure safe and don't explode like glass does if you add too much sugar.
The pop top ones are great and I love them but it's easy to mess something up and make them pretty dangerous.
If you have a hygrometer you can measure the sugar content of your brew which takes out the guess work, get one of them before glass bottling. Hygrometers are like $10 and well worth having.
Plum and cherry wine sounds divine. Good luck!