miss elam newbie

i just got a used miss elam brushless and i know nothing about her.
i didnt even know what size it was until a minute ago(thanks to a ose member)
im going to try a couple of 3s lipos for starters and was wondering about the stock prop.
should i get it upgraded and if so does anyone have a size and type and or any other
suggestions.
oh and radios..... can i use an old buggy radio system in it like a am 27 or a am75?
i also have a cheap 2.4 system with a micro receiver.
thanks for any help!