These questions belong rather to the discussion board of the openSAP course - but here it goes.
To connect to your instance via the SAP GUI, you can use the IP address of your instance as the server name and 00 or 01 as the instance number. The SID is ABA.
You should have received a link to a guide talking about general information for the instance, among them there are standard user names and their passwords for client 000 and 001. The default password for these should be the password you specified when you set up your instance. If you don't remember it, then you can log on to client 001 with user OPENSAP and password Welcome1.
To access the system via the webgui, you need the proper URL. To get it, you can simply go to transaction SICF and select service name webgui then test the service which will give you the URL.