Lets say im creating my own cryptocurrency and my own blockchain on ethereum, what would be the basic costs for setting all this up if i am developing on Ethereum
If you use your own blockchain you don't need to purchase any Ether. So the costs would be zero as you can just use your own blockchain with own internal cryptocurrency.
Of course you will probably have other expenses, such as development costs and upkeeping miners, but those depend totally on how you plan to manage the network.
For blockchain application development cost you can refer to this link. It portrays all possible factors/solutions determining cost for development over blockchain blockchain app development cost
Well!! Blockchain development cost differs as per the location and skill of the developers.
You can refer to this link: Blockchain development cost
$45,000 for beginners $250,000 for experts
Freelancers $30,000 for beginners $60,000-$75,000 for experts
Outsource company $175,000 to $225,000 for beginners $300,000-$450,000 for experts.