Introductions discussion

Hi Guys I have been reading plenty of posts here and found the site really helpful; just wanted to ask you a few questions about being in chastity. My Girlfriend of five years and I decided it would be good for me to try out chastity. Our sex life was great, but lately it hasn’t been, so we are trying to spice things up and kick start it again. I bought a 7” dildo with a 5” girth to use on my girlfriend, along with a vibrator. The dildo is definitely bigger than me; I am 5.5” length with 5” girth. My girlfriend REALLY enjoyed me licking her clit while gently thrusting her with this big dildo (big for her anyway!) It also REALLY turned me on seeing how worked up she was. We know quite a bit about chastity but never went all out to try it properly; I mean, she does from time to time not let me cum for days on end, even after sex or me licking her clean. We will just go to bed without me cumming. The only issue is it leaves me horny as can be, and I end up sleeping with a hard-on, so we thought buying a chastity device would be a better way to please her without me constantly “poking” her in the back (I don’t mean to lol). She and I have also noticed how much more obedient I am when she doesn’t let me come for a few days. I do a lot more around the house, cook dinner, give her foot massages (this is expected anyway as I have a foot fetish:p). So I did it; this morning I purchased a CB6000S. I got the small size because I heard they fit better and stay cleaner, since my penis will reach the end so I can pee. I have never been so excited to try it in my life. I even paid extra for special delivery, so it arrives tomorrow before 1PM! I am just curious: after my girlfriend gets me in it and takes away the key, will I still always feel horny like when she doesn’t let me come? Will it hurt if my penis tries to go erect? And will I still ooze pre-cum even if I can’t get an erection with it on? I found myself constantly being hard at work thinking of my girlfriend and us using that toy on her. Wow, I’m getting hard typing this now lol. The only problem with constantly being hard is my penis leaking out pre-cum; will this still be a problem in chastity? How long do you guys recommend staying in it for rookies? I think the longest my girlfriend has kept me without coming is about a week, and I would LITERALLY do anything for her. How easy is it to keep clean? Am I allowed to ask her to unlock it so I can shower every day? Or can I clean well enough with it on? I promised my girlfriend I won’t moan or complain about having it on. If I ask to come or play with it, she will keep me in longer! She is naturally dominant and known for being a control freak; I suppose I am a bit of a submissive, so it’s a perfect match. We both love each other to pieces, and I will definitely be with her for the rest of my life. Thanks for reading guys. Any tips or advice for a beginner to maximize pleasure for my girlfriend while I’m in chastity would be greatly appreciated.