Generally, they give out more HD's and D's in the higher subjects due to difficulty + it would probably help you in the future as 1141 covers some extra material which is not included in 1131. Not sure if Physics is the same but I'm assuming it is.
Pick 4 courses per semester, don't worry about majors and minors right now. The order matters because some courses have prerequisites.
U should probably pick ACCT1501, ECON1101, MGMT1001 and maybe COMP1917 if you want to do a comp sci major.
It is probably the least you could expect 2 pay 4 sharing...
Also depends on what kind of rent you want to be paying. Some are like $200 a month and others are like $500 so it makes a huge difference.
And its only an ESTIMATE.