Atari-Midi Archives

hello everybody,i,ve just joined,totally new to ataris,won midi reply 
on ebay and am about to install harddrive and stuf on an atari 520ste 
I think.Its all new to me,any advice please give it,I know nothing 
about ataris,all my midi stuf has been amigas,running music x and 
drts roland editors,but was after trigering samples via midi so 
thought I,d give ataris a go,plus all those editors for them old 
synths.Will I be shunned been into amigas?Or do we have a common 
enemy?PC,s(i use them as well,what a slut)