I usually look at previous day chart with stock that had moved up most in positive positions once i check that  I look at after hours trading chart and compare last one month chart open market and after hours market chart. Addition I look for if there is any latest news about company I am betting on. Once I check all these i buys calls if higher amounts involves i go for long date but if amount is small I go for weekly options. Once I see 20-30 % gain I sell the contract.