"I am having a hard time marking a bootable USB Flash drive. I am using a windows laptop to do it and it complicated."
This is something that is best done "on a Mac", using either "Install Disk Creator" or "Diskmaker X".
However, there's another way -- you can also boot to INTERNET recovery (this IS NOT "the recovery partition").
You haven't told us WHICH Mac you have and WHAT YEAR it was made.
This is important information.
Internet recovery works only on Macs from 2011 and later. It also works on SOME (not all) 2010 Macs.
You can try internet recovery by doing this:
Power down, all the way off.
Press the power on button and IMMEDIATELY HOLD DOWN
Command-OPTION-R
... and KEEP HOLDING THEM DOWN FOR A WHILE.
You will see the spinning globe that indicates that internet recovery is loading.
It takes a while, be patient (you can let go of the keyboard once you see this).
If you are connecting via wifi, you'll be asked for your wifi password.
Enter it.
When you get to the internet utilities, open disk utility.
IF THERE IS A VIEW MENU, you must go to it and choose "show all devices".
(if there IS NOT a view menu, ignore this).
If you look at the list on the left, the topmost item should be the physical drive inside.
This is what you need to erase.
Click it and choose "Mac OS extended, journaling enabled, GUID partition format".
When the erase is done, quit disk utility and open the OS installer, and start clicking through.
WARNING:
The above will WIPE OUT all your data -- so you need a backup!