What to do? Reinstall? Help using TM

I just got an external hardrive in hopes of backing up my MacBook and then clearing off as much as I can and then just bringing back the things I need. I feel that my mac is so cluttered up and is running slower lately. I've had it for a few years now and there are things I don't need anymore and files and apps I don't want to get rid of, just not have on the system all the time. I'm just scared to officially lose them, yet I want the space on the computer!
What should I do? Will Time Machine work with a resinstall? Or is there a better option? Any help would be appreciated. I am new to Time Machine so I don't know what I am doing! Thanks!

If you want to remove files from your hard drive then Time Machine is not how that's done. If you want to use the external drive as a backup drive, then you cannot also use it as additional storage unless you partition the drive and use one volume for your storage needs and the other volume for your backup. The backup volume needs to be at least the same size as your main hard drive. If you use Time Machine for backup then the backup volume needs to be at least twice the size as the main hard drive. The remaining space on your external drive could then be used for additional storage.
Extended Hard Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Set the number of partitions from the drop down menu to two. Set the format type to Mac OS Extended (Journaled.) Use the sizing gadget to adjust the size of each partition to what you will need. The backup partition should be sized as I outlined above. The remaining space will be the second partition. Click on the Options button, set the partition scheme to GUID, then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select a volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
7. Repeat Steps 4-6 for the second volume.

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