hello nairalander, i want to put up a forum what and what will i need e.g  what type of hosting platform and how many megabyte will be oaky

A forum script, someone to install it and maybe tweak or customize it, a web hosting plan with enough bandwith and diskspace that will ultimately depend on how popular your forum will be and the amount of traffic.

Get as much diskspace and bandwidth your money can buy, it is better that way.

thanks for the info, i stumble on simple machine during my research i learnt i can use it to administered forum pls do you know anything about this machine

Yeah, it is very ideal forum script, use it without any reservations.