I would recommend to not use it until you get an S. But if you really want to, you can put them in a maxed out A tool for now so you can gain some power until you gain an S in which case you can just recycle the previous A tool.

which tools should I get

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I saw that 3 ropes and one of the other is good, but not sure

It depends on your lineup in most cases. However, the more popular combination is 3x Golden Rope and 1x Gourd. The gourd in most cases would be on your Main character and the 3x Golden Rope would be used on your other ninjas in your lineup.

You can find more information detailing the Treasure Tools and what they do here. Courtesy of ICE*

Actually its really easy to create the treasure tool you need , as long as you know wich team you gonna use

For example a ninja that needs a - High combo rate and ninjutsu would need an S fan ( Naruto 6 paths , AGK , Edo hiruzen)

- High combo rate and atack would need an S blade ( perfect example Minato Jonin )

- Now a ninja wich gives shields would need an S gourd , as its raises his base rezistance ( Earth main , Iruka , Bee 7 Swords ... )

- Now for the rope .... any support ninja could use this

These exampels is for what i use .... also try to get your 1 pos ninjas treasure tool to level 10 or 12 ( fields i mean ) , then move on to 2 pos level 9 each field , then main ,and so on .

Have fun .

don't worry, once you recycle an item you get back 100% of the essences.

People tend to get ropes because crit/injury combo is the best deal both in terms of offensive and defensive stats because majority of the damage comes from crits. And the reason to use gourd isnt exactly resistance and defense buff but control.