[MENTION=42203]Nitro Zeus[/MENTION] walaikum assalam rahmatullahi barakatuh
Never pray any salah during sunrise; in Hanafi madhab (The school of thought practiced by more than half of Muslims of the world) praying during sunrise invalidates salah, I.e. salah is not excepted by Allah during then
You can pray ishrak 15-20 mins after sunrise begins.
If you want to pray lots of extra salahs to Allah, then as long as you avoid the haram and makruh times you can pray as much nafl salah as you like. Nafl is prayed same as 2 rakaahs fard but with the intention of nafl
Ishrak is prayed 4 rakaahs; the 4 rakaahs is prayed in 2 rakaahs each and not 4 all together, I.e. you pray 2 rakaahs, finish that salah and then you pray another 2 rakaahs
Some wali Allah of the past prayed upto 300 nafl rakaahs a day
- - - Updated - - -
In Hanafi madhab ishrak is prayed 15-20 mins after sunrise begins. Just starting after 15 mins is fine too