Gonna reply to each part in steps.
How many g should I cut my carbs to? Or if it's not such a lean bulk what would be a better amount to have?
Will do some HIIT skipping I think, how much per day? 30minutes?
I like to keep carbs under 200g, if you're able to keep it under 150g you'll be doing well in terms of keeping lean whilst achieving some sarcoplasmic hypertrophy.
HIIT is hard work, 30mins is challenging. Start low and work your way up.
Try the following programmes 30s, 60s, 90s going from beginner to advanced on each:
http://www.intervaltraining.net/hiit.html
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My sleeping pattern needs to change a bit, goes bad when it's hot weather
I was doing 1 day on 1 day off, the thing is work makes it more difficult, but I could always do Monday, Weds, Thursday, Saturday, Monday etc. and roll it over as you say. The split was harder for me to work out, I asked some people for tips on that before but didn't get much, because I had chest and shoulders on the same day, which was killer, so I had to re-arrange everything. What bits would you change around?
Can't help with the sleep, but can suggest you read a book before bed, and don't use the computer for 30 mins before bed time, same goes for tv.
Chest and shoulder aren't fun to mix.
You've got several options. Do 3x full body work outs. With about 5/6 exercises per workout (roughly). Or incorporate some supersets with them.
Or do some push/pull splits.
Or a more classic chest/bi, back/tri, leg/shoulder split.
When you roll it on just do one day on one day off one day on, off etc... This importantly means you're hitting each body part twice in 10 days which gives good time for recovery and growth, but still capturing your CNS firing hard. Clearly with a full body workout this is less curcial and a 3x a week workout will be fine - but a lot harder!!
Was doing lunges and things before, but had to be 1 of my most hated exercises, so I dropped it. If they're worth taking up again I can always do that.
If you didn't get on with them then you won't be motivated to do them, step ups, split squats, and front squats are worth looking into though.
4 sets and 8 reps per set, unless it's pull-ups or dips, then it's 4 sets and done until failure.
Ok how challenging is the last rep? Do you feel you have more in you? If so shove another set in, or increase the weight!
Will look in to some of these, how many exercises per session would be good, and what would be considered "Too many"
Depends on your intensity and rest/recovery times. 5 exercises per session is good. I do 4 normally but I train more often and do a different volumes. I sometimes superset, in which case it might increase to 6. It really depends on how you feel your body responding.