Hi Rick,

please don't use it without a load attached. You may be lucky and get away with it for a very, very short time, but I suspect as it's your first head it'll possibly be f**ked for good and if you have similar luck to me it'll likely burn your home to the ground too. 
The emulated out / headphone sockets aren't the best way to hear your new amp as it deserves to be heard and may even disappoint.

I'd urge you to loan (if at all possible, maybe even hire) any suitably rated cab and crank the thing up nice and loud and appreciate what you have worked hard to purchase. I'd even advise against any kind of dummy loads. They can fault the same as anything else. Headphones (even quality ones) are at best okay for late at night, but unlikely to provide anything like the tone you want to hear. 

I expect this piece of kit has cost you more than just the cash itself and is something you have desired for a while? Please (this sounds awful and also makes me sound a proper c**t) but you may need to be patient a little while longer. Every minute will likely be killing you and I feel for you deeply. I promise though, you definitely won't get help from anyone should things go "tits up".
I'm positive you'll enjoy the fruits of your labour soon. 
Take care,
Best wishes,

Si. 

Many thanks for your much contained response Si, there is a lot in there no worry  I have not tried it powered on. I will wait for the time to come no  doubt. Sorry to hear about what happened that's serious stuff!! I I hope everything got sorted out though. All  best to you too thanks again for your help.

Best Regards 

Rick. 

🎵🎸🔊.