Your hardware looks suitable, the upgrade process for most is smooth but sometimes it can go wrong.
My advice is still back up though, yes you mentioned you have a lot of files but you can always use a disk cloning tool
Yes, will back up first!.
If you want help stopping it upgrading (and hence stay with your current system)I can give you all the information you'll need, but the decision of whether to upgrade or not has to be yours. I would however suggest that what you stand to gain is pretty minimal whereas your losses could be enormous, it's all the usual risks of changing OS and the things (hardware and programs) that may become incomaptible if you do so. Whatever you do, make a system image now, whether you choose to upgrade or not it may come in very helpful some day. http://www.bleepingcomputer.com/tutorials/create-system-image-in-windows-7-8/#manual
I know that some software may not work,but by looking at the Windows 10 i may like it so will give it a try.
I kinda like win 10 but there's some bugs but I can deal with it
Yes, all windows have little bugs, but with time they will be fixed.
The stuff on your pc should already be backed up. so losing it during the upgrade it should not be an issue. The vast majority of upgrades preserve your files and programs, and allow you to roll back to the previous os for 30 days. But, stuff could happen.
As rp88 said, it's up to you. My experience was 98% positive, but YMMV.
Yes, will backup and will upgrade to Win10, hopefully all goes okay.
Thank you for help! Thank you.