Bail in case the accused has been sentenced by the sessions court

 One my collueges was sued u/s 419 nd 420 in 2009. Having being in custody for 3 months got bail after 3 months. With all mighty blessing and lawyer hard work there were many loop holes in state councils application Like cutting(name of accused) in fir,contradictions in witness statements,even IO statement was dillemic On all these grounds the trail court aquitted the accused in 2015. Since state council moved to sessions court Now the decision is supposed to come by this month end. I want to ask what if i got convicted,can i appeal for extension of sentence in the sessions court itself or weather i should have to move to high court and how much time would it take get bail. Is there any provision that acused have to spend certain time of imprisonment before getting bail after being convicted by sessions court?