I think that you should better try to speak using correct words and with a good accent than trying to add “filler” words.

Those words will naturally come when speaking more and more with native french speakers.

If you push yourself to do it you may abuse of them and use them wrongly. If you use random words, native speakers will find it very strange (or funny) and the meaning of the sentence can be completely different. Don’t take the risk if your are a learner

I hope it helps you given that it is only my opinion

Moreover, french speaking people do not use filler words as english speaking do.
You’d far better learn “connecteurs”