some really good ideas here, and your original plan isnt bad, but a few thoughts that I have
- dont use dumbell movements for the 5x5 part, they go up by 5lbs each, which is 10lbs total, and you will plateau very quick that way(I press 140s for incline chest, and still wont use them for 5x5). with a bar you can add 2.5lb plates
- it wont really matter on chest if you start with flat or incline, just make sure you do enough for both. I always start with flat, but the next 2 exercises are incline, and you can see from my avatar that it balanced my pecs out pretty good
- 5x5 legs really needs to be squats, thats where the size is going to come, follow that up with leg press and hacks in the 8-10 rep range, and you will build hella big quads
- like want2bbeast said, its not a race to the big weights, start light. The growth comes from adding weight every week, and the longer you take getting to the big weights, the longer you can keep adding. For example, my last heavy leg workout was months ago, I squatted 465lbs for 5 reps, then I started to diet so I lost some strength. That was a few months ago. In a week I start going at it heavy again, but for the last 2 weeks I only squatted 365 for 10 reps. Next week will be 385, then 405, then 425, etc. 1/3 of the way into this bulking cycle I will be back at the heaviest I have squatted, but by then it will be a joke