For your arms soreness Cariad I guess you could try to get someone massage your arms or other points that hurt or put Icyhot on the place it hurts usually it helps too, I also suggest basically not really doing everything together, if you do arms, go on for a day only arms, meaning lets say
Sunday - Arms
Tuesday - Legs
Thursday - Cardio
I usually do 9 minutes of abs at the end of each workout which is basically like 20 reverse crunches, 20 toe touches (if you can't keep your legs straight for long then short crunches) and 30 seconds of plank and I repeat it about 4 times.