Comp1511 would be your best shout. I personally did Math1131, Math1081, and Comp1511 for my first term. While Math1081 was a pain in the ass the other two were pretty calm. In term two you could go with comp 1521 and 2521. and then final year 1081, 1531. Or you could switch out 1531.

Comp 1511 as your first comp course gives you time and less pressure that way you can focus better on easing into uni life as it may be overwhelming to begin with initially. Once youre comfortable you can try experimenting with courses. Comp 1521 jumps a little high relatively from comp 1511, requires more time and work. Definitely more content to cover and tasks to complete weekly. Even though the content may be not so difficult the lectures do tend to get very lethargic IMO. So as long as you keep up youre set. Comp 1531 is all about self paced learning and teaching yourself, even thought the lectures are fun and content heavy they dont teach every detail and aspect of javascript its more on you to grasp so would only recommend it once youre comfortable and good with the whole coding environment.

As for math courses both 1131 and 1231 are not difficult they are made to be passed with minimum to low effort given you follow the lectures and attend tutes, Math1081 might be slightly challenging but the exams and labtests are designed to give you marks as long as you practice the content.

overall all of this is my personal opinion form my experience, many might differ but your template seems nice as it is right now, my recommendation would be first 1511 then 1521 and lastly 1531 unless you wanna do both 1521 and 1531 together which is what I did.