Firstly, thankyou to anyone taking the time to answer my questions. Im new to all this so go easy on me 
Never owned a Mac before so rather than buy a brand new one straight away, i have opted to go for an older, second hand machine to see if the whole Mac setup works for me
The machine i have bought is Mac mini G4 1.42Ghz, 512MB Ram, 80GB Hard drive. This isnt the super drive model unfortunately. Questions i have are as follow:
1. Im told the maximum memory the machine can support is 1GB (2x512mb) I have however seen on youtube, people insert 2GB (2x1GB) Is this possible??
2. Is the machine i have Wifi enabled or will i have to connect via Ethernet??
3. Can i use a wireless mouse and keyboard??
4. Can it support OS X Leopard 10.5.8??
Many thanks for your time, much appreciated

Never owned a Mac before so rather than buy a brand new one straight away, i have opted to go for an older, second hand machine to see if the whole Mac setup works for me
The machine i have bought is Mac mini G4 1.42Ghz, 512MB Ram, 80GB Hard drive. This isnt the super drive model unfortunately. Questions i have are as follow:
1. Im told the maximum memory the machine can support is 1GB (2x512mb) I have however seen on youtube, people insert 2GB (2x1GB) Is this possible??
2. Is the machine i have Wifi enabled or will i have to connect via Ethernet??
3. Can i use a wireless mouse and keyboard??
4. Can it support OS X Leopard 10.5.8??
Many thanks for your time, much appreciated