this is not a simple problem to diagnose unfortunately. this would be one of the few times i would recommend seeing a good transmission shop about. no reverse and your codes indicate incorrect ratios on 2nd and 4th gears...there is a few items that can cause this. i'd like to rule out shift solenoid since this is occuring on more than one gear - 3 in fact. may have to do with the kickdown assembly...meaning it will need a rebuild if so.
check the simple thing first - the trans oil level. see if it looks good cold, if so get it hot and then check again. hot is the only way to get a truly accurate level reading, but do check cold first to ensure you're not running it dry warming it up.
When i first start car it goes from 1st to 3rd ,After 10 min or so im stuck in 1st. Would the pulse generators be a partial cause and how to test them. Cant find any where info on the P0732 cause and fix, only the P0734.
diagnosing a problem such as this is not going to be simple, there are multiple causes that must be crossed off as a possibility one by one. this is a step by step diagnosis that requires a little experience. i can't say what it is without getting my hands on the car and going through these items one by one. nobody can.
start with obvious. check the oil like i already said.