First day questions

Just did this for the first time. Also it's been about 6mo since I last did any sort of lifting. My questions relate to the weight I'm using. For squats I warmed up and did what felt heavy/hard for me at 75lbs but then I cranked out 16 reps (14 with good form). So now I wonder how much I should increase this to? Also if I was able to do the T2 with no issues just increase the weight? TIA