Source not available on fresh install

I am from debian background.
When I install RHEL73 or 74beta, I don't see a list of sources in /etc/yum.repos.d
1) Is it normal?

I made my iso a source in /etc/yum.repos.d but still cant install packages suc as 'Development Tools' for which get an error/info message like below

[root@localhost marty]# yum grouinstall 'Development Tools'
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-
: manager
This system is registered with an entitlement server, but is not receiving updates. You can use subscription-manager to assign subscriptions.
No such command: grouinstall. Please use /usr/bin/yum --help
[root@localhost marty]#

can someone help?
TIA