ITunes and iphone and iPad

Ok so I have a iphone registered with iTunes… With all my music on it… I have just got a iPad it has the same iTunes password and username as the iphone but I don't have them on iCloud if I plug my iPad into the iTunes I have existing will it wipe all of my music existing off? Or will I be able to use my iphone and iPad on the same iTunes on my computer

ITunes can support numerous devices. Your music and purchases will not be removed from your iTunes Library. You can also put the songs and stuff onto any Apple device registered to your account.

And in the event your purchases are lost, you can restore purchases as long as they were purchased with your account.

As long as all the music on you iPad has come from the same itunes library then you will be OK to sync. However if you iPad data is from a different computer then you will be able to plug it into itunes but as it tries to sync click the X button on the middle top banner of the itunes window and it will cancel the sync, this means nothing will be wiped, then you can click on your iPad tab on the right (If it isn't there click Ctrl+S) and on the options it should say "Manually manage Music" tick that and you can transfer any of the music from your itunes library to your iPad. As for you icloud you need to go into the settings on your iPad and find the iCloud options and just sign in, everything will be synced over Wi-Fi (Contacts, mail etc.). Hope this helped.