I think some of the instructions given apply to emulators they don't really help you getting a basic program running on the real deal.
Here's what I do with APE/sio2pc to get basic programs running on my system, hopefully the guys can shorten the steps if possible but this will create a disk image that you can use to load up all your basic programs from now on
First, have your basic cart in, then boot up the computer with a dos formatted disk in drive #1 of APE or in a real 1050, maybe a Dos 2.5 or 2.0 disk or someother disk that you know has a DOS on it. At the ready prompt type DOS to get to the dos menu.
Now in APE release the first drive. Create a new .atr image with APE (you can do that in an emu too) Mount the blank .atr in Drive 1 and format it in DOS. Write the DOS system files to the disk. Then move the disk to slot #2 of APE.
Make sure you have put the basic listing (like Adventure.Bas) in your PC-Mirror folder. Then mount the PC-Mirror directory as Drive #1 in APE. And now back to DOS you press copy "C" and then type D1:Adventure.bas,D2:Adventure.bas
This will copy the basic listing from the PCmirror to your new dos ready disk. Now all you have to do next time is boot this new disk in drive 1 with Basic inserted then when you see the ready prompt you type:
LOAD "D1:Adventure.BAS"
RUN
To see the program listing you can also type: LIST
Once you know the steps it really takes less than a minute. Maybe someone else can better explain what a DOS disk is to you