I have budget of 300 to 500$ for this project
Is my budget is enough to start own gambling site , exclude advertising.
How much time I need to spent on this?
Which features should I add in my gambling site? ( Games or etc.)
Anything Else or any suggestion.
PLEASE DONT COME IF YOU WANT TO LAUGH ON ME
( I don't have any knowledge but I want to invest my money somewhere which give me good profit or only profit)
Well it's always a good thing to plan to start something, but your budget is very low. You would require a good amount to just buy a good script, then pay to make it look beautiful, add good security measures, you'll then need a good amount of money to pay your user's. Hence I feel you're yet not ready to start your site. Rather you could invest in ICO or partner with reputed casino. That will help you.