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how to timing the car?
Oh dear you need the special can locking kit with the tdc locking pins ,Reno’s are a ##&&% to work on I know I got a modus 1.6 its the same set up ,they also use a dephaser cam gear so if it starts to make a rattling sound on start up get it changed , only use synthetic oil and change the filter twice a year because they are so small , buy a can of silicon spray and spray every electrical connection and fuse box ,these things are prone to damp , Hope it helps you ,good luck !
There is a perfect book for repairing this car on your own. Give it a try https://haynes.com/en-gb/renault-megane-…
I changed the timing belt a few years ago. I didn’t use any locking kit. The hole to lock it is inaccessible. It looks possible in the Haynes book but it isn’t. I marked up everything with a white pen and took the chance of nothing moving. It worked fine and I saved 500£/€$. I took my time when I didn’t need the car.