Ok, if you can get mature filter media from LFS, you put all of it in your filter, it depends what they give you, usually something like bio balls.
Just put that in one of the compartments in filter with sponge media next to it or something like that, depending on your filter.
What kind of fitter do you have by the way?
external/canister filter
or internal filter
If someone says you can have some of their media, try just to take about a third of their sponge media, some ceramic rings from the filter and maybe some gravel/substrate if they are willing, a plant cutting or two may help to establish your tank as well.
Anything will help basically to get your tank to get started.
Just put that in one of the compartments in filter with sponge media next to it or something like that, depending on your filter.
What kind of fitter do you have by the way?
external/canister filter
or internal filter
If someone says you can have some of their media, try just to take about a third of their sponge media, some ceramic rings from the filter and maybe some gravel/substrate if they are willing, a plant cutting or two may help to establish your tank as well.
Anything will help basically to get your tank to get started.