the elastic is the same idea as what line you use for a rod
i have 2 top sections one is a light elastic for up to 3lb line & i have another heavy line for carp..if you are very unsure about pole elastication & what line to use i did write a thing about it on here
i hope this helps
silver fish no 6 elastic 5lb main line 4lb line size 18 hook
carp summer time no 16 elastic 10lb straight through size 12 hook
this is a general way of setting up a pole but it all depends what sort of fishing you like
