Can anyone tell me the breakdown of costs incurred should I decide to issue my custom token on Stellar?
If you're asking about the network costs, they are almost negligible.
1 XLM + change, for the issuing account
1.5 XLM + change, for the distribution account
Fees are 1 XLM per 100,000 operations, and you need a handful, or two, of those.
There are the base fees on stellar, which are almost nothing. You need to plan on having an issuing account, a distribution account and maybe a warm reserve account. With trustlines, etc. about 8-10 XLM goes a long way.
The real cost is all the rest. You will need a domain + stellar.toml hosted somewhere with https. So, you have to consider the hosting cost for that as well.