You will want to start with this tutorial over at HackInformer. Be warned however that many people, myself included, have not been able to get the listed VHBL working as a bubble, but you can use other homebrews as well that do work.
***I HIGHLY recommend that once you have gotten to the point where you have your app.db file on your computer, you save a copy of this file somewhere else on your computer as a backup.
There are two major changes you will need to make to the steps listed in this tutorial however, as I was never able to get them to work as listed.
First, instead of using the signing tool listed in step 3, the only one I was able to use was SignFakeNPExpert by LMAN, which you can download here. To use this: Source ISO is the ISO you're trying to sign, Base PSN Eboot is your base game's EBOOT.PBP file, extracted in step 2 of the tutorial, and the other options are unneeded so you can just click the Disk icon to sign your file.
The second change is to ignore all of step 5 of the tutorial. Instead of modifying your app.db file yourself, use this tool (modified by myself to remove the character limit on the path, but I'm not sure who made the original). Here's how to use it: Open your app.db file in SqliteBrowser, and click on the Execute SQL tab. Type your information into the tool I provided and click "do it!", then copy the code it gives you and paste it into the top pane of the SqliteBrowser window. Click on the Execute SQL button (looks like a Play button on your TV remote), then go to File -> Write Changes.
After you've done that, start back at Step 6 in the tutorial. Once you've restarted your Vita at the end of the tutorial however, there's one additional step that's not mentioned: You MUST delete your base game from your Vita and re-transfer it back to your Vita before your new bubble will work.
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