@Umesh ****
Use the Agoda hotel booking website or phone app..
You can search in your price range and read hotel reviews as well..
You can use filters for things like hotels with swimming pool..
Also has a map feature to check location..
Make sure you are walking distance to the beach and plenty of restaurants and bars.
Start looking around 1500 Thai Baht (about $65 Australian dollars) per night and see how you go..
There are cheaper options and many much more expensive options but that's a good starting point for 3 star hotels and you may even find a couple with pools for that price