If bike not too hilly consider an Tri bike set up – ie aero bars but not too aggressive. As others have said practice bike run transition. A lot! It’s very weird.
Main advice would be decide how much time you can realistically spare to train and then get a programme built around that.
Although boring time on turbo and treadmill doing intervals gives v high quality training. Split long runs can help too.
Programme to work to helps – it is hard enough without having to think about every session.
It is very doable – I went from having meet done a Tri to doing a 10hr 40 ironman in 20 weeks. At the time I was working 60hr weeks. The key was v careful planning. Am not willy waving!
PS if you’re 6ft plus and need a wetsuit for training I have one you can have for free