Hi, new semester usually starts in Sep, so u should check with ur teacher. Sichuan university is a large and famous university in southwest China, so don’t worry about the university.
The atmosphere is colder than Guangzhou and have 4 seasons. When u get here in Oct it will be autumn and getting colder everyday, so u should prepare some long sleeve cloth.
Nightlife is pretty much the same in most cities. As for part-time jobs, i think it should be easy for u to find 1 teaching foreign languages.
I don’t know about the dorm, but if u want rent 1 room apartment the price is around 1600RMB/month.
If u want more info please contact my wechat: 494479149. PS: Im also majored in software and now doing a job as programmer. I’ll be glad to be friends with u 🙂