__You could have cloned your older HDD to your new SSD and get all your Documents and programs and games installed, but a fresh install of windows on the SSD is much better and worth the time to re-install few apps and games.
__Some SSDs come with a custom small version of either Acronis or Macrium Reflect to help with migration from older drive to SSD or you could download the tool from the SSD manufacturer website ( Samsung has Samsung Migration tool : once download and installed on your older Drive it will assist you cloning it with all it's programs apps games and files and folders to the new SSD
To transfer your documents to the new system, have older hard driver attached to your system ( of course) as internal drive or as external through USB, then :
1. BEST AND SAFEST WAY: you could do a manual copy and paste for each specific folder, one folder by one ( from older drive to your new one obviously) folders like photos, my documents etc
2. you could do file back up recovery while your older system it's RUNNING do a FILE BACK UP using windows built in back up tool. ( Do not perform a complete system back up, just files and folders), then switch boot drive to your new SSD windows system and launch windows recovery tool and point it towards the file and folders back up you created above
How to Quickly Transfer Your Files and Settings to a New PC (or Mac) >>https://www.howtogeek.com/211256/how-to-quickly-transfer-your-files-and-settings-to-a-new-pc-or-mac/
8 Backup Tools Explained for Windows 7 and 8 >> https://www.howtogeek.com/189452/8-backup-tools-explained-for-windows-7-and-8/