Hello,
So two quick points to start.
1) Dimes and quarters do not get along, I would not use them in the same set. I would either do one of the following
a. Play with the small blind and big blind at 25¢ so you can eliminated the dimes.
b. change the blinds to 10¢ - 20¢ or 10¢ - 30¢ and do a progression with 10¢ - 50¢ - 1 denoms
2) You have over half your set in fractional chips and are way too low on singles and fives.
Five hundred chips is tight but doable for a single table game. We just have to focus on the stake you are playing and not worry too much about future proofing.
If we pursue option "a" and forgo the dimes and reduce the quarters, this frees up a lot of space within 500 chips to bulk up on singles and fives.
I would suggest 100/300/160/40 of 25¢/1/5/20 denominations for a total bank of $1925, or just over 4 buy-ins per player at 9-max, which should be plenty.
For $50 buy in, your singles are going to be your "workhorse" chip (the denomination you should use to bulk the starting stacks) and it would be good to be able to give at least 20-25 to every player, and having this many on the table makes it easy to change for fives or twenties as needed. Imo, fives are too high of denomination to consider your "workhorse" at this stake. Just five chips would make up half a buy in. That's a bit too much for my taste for starting stacks at least. Imo, if you limit your starting stacks to 4 five-dollar chips per player, that's the "sweet spot" where you will still have enough lower denominations on the table to make change-making simple and rare.
With that in mind, for constructing stating stacks, you can make your first 8 stacks using 12/27/4 (of 25¢/1/5) for $50, and then a 9th stack of 4/29/4 and then you will have exhausted the quarters.
(Since not all players start at the same time with cash games, some hosts will just issue 20 quarters in each of the first 5 stacks, and then everyone else gets singles and fives for simplicity and can buy a couple dollars of quarters from what's on the table.)
Now after you have all the quarters and nearly all of the singles on the table, it's fine to issue rebuy stacks with most of the value in fives. Unlike with starting stacks, when you issue rebuy stacks, the requisite change required is on the table so it doesn't create too many change-making issues during play.
After the starting stacks you will still have $675 in singles and fives left over for the next 12 rebuys before you even touch the twenties.
Again, this suggested breakdown is geared specifically for the $50 buy-in you mentioned. It would probably be good for $60 as well. (32 total buy-ins) Even $100 is probably okay at 19 total buy ins. It's still two per player which would actually be okay most nights, but you probably want to have a contingency of allowing $20 notes to play once the bank is exhausted. Alternatively, adding 100 fives to the breakdown for a 600 chip set would work as well if you find this would become a regular stake and then that whole range would be well covered.
FWIW, I am partial to 600 chip sets because I like these sort of "cage" storage cases with the racks as opposed to the suitcase style cases, but it's a matter of taste.
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So I hope this helps. I was trying to fill in the "why" with my preferences here and trying to work within your original constraints.