Hey
@Syd1198 .....
Happy to hear that you want your penis to grow....
Even more happy that you are married and you want to have an even better sex life with your wife...... This is something I want to when I'll grow up....
You even have nice stats which are really impressive.....
Getting back to your questions.....
Right now, you are a noob and do not know where to start..... I have been there too.....
Start with the newbie routine.... It is the most effective routine for beginners like you.....
In the first 2 weeks, your penis will grow significantly...... After that, for a very long time you will not see any gains(This is completely normal as your body will take time to adapt to PE). This time depends upon your health, physique, lifestyle and also age. After that you will see gains depending upon the intensity of your routine......
You do not necessarily need a device. As long as you can increase the intensity with your hands, it is completely fine....
You can also ask you wife to stretch your penis

LOL .
Speaking of myself....
I have gained 1.5"+in length in 11 months(I do not know about girth as I am not measuring it)
One of your question is that whether it stays forever.......
The answer is
YES.
There is an exercise know as "Erect Stretches". This exercise is used to CEMENT the gains of your PE.
Look for more exercises in :
Audio / Video Page . This link will take you to the page with all the video tutorials available on this site. There are some more videos but I do not know where they are. Being a beginner, I don't think you need any more videos.LOL
Feel free to ask question.... We all are here to learn......
With that said........
Happy PE