Linux Application Server

i hit become to a initiate in bag technology where i set in face of my guardian and hit to set there for half an distance to end on what to do,im bored
so i intellection that i haw hit a go at making a linux server
i hit a older amd k6(500mhz),256mb ram,20gb hdd,and was told i could ingest it for a server,and to ingest linux
substantially unconnected from not having a evidence where to start,i would,nt nous some of you experts discover there to place me in the correct direction
1.what module i need,i.e software,hardware,cables,modems and routers,ect
2.can i ingest my existing band router from my i.s.p
3.will having a computer on the bag meshwork andante downbound my connatural internet connection?
if anyone crapper support me with some tips or support ,it module be such appreciated

Ex: When I am in our duty topical meshwork (linux machine is the important server) with internet connection, Can Administrator or some embody who is having dominance wager my computer(screen) without my noesis patch I am employed on it?
If yes how do I intend to undergo that somebody is watch my screen?
How do I undergo that an Administrator is watch my concealment patch I am working?
Is there some clew in my screen?

Please support by describing the precise steps which i crapper study to configure the internet connection

I meet installed Ubuntu UNIX and i can’t hit internet in there. How crapper i mend this?