Yay, welcome home Fitz and well done for being such a good boy on your first night. 
Mintchoc, as long as he goes just before you go out and you're not out more than a couple of hours he should be ok. You usually find they're too nervous to wee out and about the first few times anyway, but I always take a puppy pad in my bag just in case, so I can put him down if I need to. Can't believe I'm still lugging him around, he weighs a tonne and has discovered this morning that he's no longer small enough to run under Lurcherboy's stomach! 
Pip has never wanted a wee while we are out - but runs straight outside and produces gallons the minute we get back!
Sebastian's advice about the no's is spot on. Much easier and more pleasant to reward the good behaviour and distract from the bad behaviour and it doesn't teach them to ignore your voice like constantly giving them verbal reprimands that they don't understand anyway. An alternative is to introduce a positive interrupter sound (there's a Kikopup video on this that I used to teach Pip). I use 'Wassis' as in "What's this?" but said quicker. Basically you just say it then shove a treat in their mouth and do lots and lots of repetitions, then whenever they're doing something undesirable you can use it to get their attention in a positive way, reward then redirect. I've never used it before, but it's made a massive different to the way I handle Pip, much more positive.
Ohalvo, Cesar's methods will produce a well behaved dog, but only achieve this by suppressing the dog's natural desires and instincts, which ultimately means they are constantly stressed, but unless you are good at reading canine body language and communication you probably won't see it. I am only just learning about reading canine communication and it's really opened my eyes up. I've never used punitive training methods, but I can clearly see when Lurcherboy is stressed or worried about my tone of voice or body posture now and I feel awful that he's probably always felt like that, been giving me consistent calming signals to let me know how he was feeling and I've effectively been ignoring them because I didn't know what I was looking at. I read a book over the summer call Calming Signals, by Turid Rugaas and have since watched some of her YouTube videos and also some by Dog Communication by a lady named Penel and it's fascinating stuff and so useful if you want to really understand your dog and what it's trying to tell you and other dogs. You don't need to go into it in that detail though, just following someone like Gwen Bailey or Grisha, will ensure you handle your dog positively and have the same positive effect.
Pip is back to sleeping through again now, thank heavens and this morning went straight back to sleep after going outside for a quick toilet break. Unfortunately, ds1 had other ideas and woke the whole house at 7.00 am. 
I have come down with dd's virus today though, so dh sent me back to bed till 10.00 and he and boys are going out for a couple of hours to Pokemon League now, so I am fully intending to veg on the sofa with dd while they're out.