Hi Sanzoni and welcome to our family. There are so many perches to choose from and in Harvey's cage he has a full java branch which takes up most of the bottom of his cage and a couple of cement perches. I have placed the cement perch at the highest point (where he'll obviously head) in order that his nails receive a bit of a filing when he's on it! As long as there is a good, steady perch available next to his bowls, then that's good. It's better to get rid of the round, dowel perches - they serve no purpose!
Toys of all sorts are essential - and rotation even more so - they get bored quickly so have plenty types of toys - saying that Harvey has his favourite that stays in there all the time. Good luck - it's the best decision you have made to get a grey - the love and interaction is unbelievable