So what are you getting?
Make sure you get aftercare instructions from the artist and follow them, assuming it’s a reputable artist. I would definitely take as many precautions as possible to avoid rubbing between pants (especially denim) and tattoo but I’m not a fan of wrapping in plastic as this traps moisture which isn’t good. Wash it gently in the shower using your hands and not a cloth then either pat dry with a paper towel or air dry thoroughly. You mentioned workout pants…you shouldn’t be working out with a fresh tattoo but casually wearing loose fitting workout pants is better than tight fitting jeans so it can breathe. Regarding creams, again listen to your artist but most people use a light ointment and not a cream after it’s washed and completely dry. Some like A&D, some don’t. Aquaphor is usually a good choice initially and then switch to a non-scented lotion like Lubriderm or Curel. Some people only use lotion and no ointment. Anything else?
Now…about those cookies!

My general rule with aftercare is ask the artist. It’s hit work with his name on it… He’ll want it to look as good as it possibly can when it comes out. Everyone you ask will tell you something completely different.

Working out is bad due to friction from rubbing against clothes, workout machines, etc., sweating and excessive movement. Let it rest and heal.

Regarding your design…I’m not an artist so I won’t be able to explain well but I don’t see that design translating well to a tattoo. I suppose the horse is doable although there’s alot going on in there, you’ll have to decide on what style you want to go with, obviously not realsim. Also, the figure on the top…how do you want her done? If it’s done the way you have it it will be “negative space” and I don’t think that’s going to work. You’re getting this next week, have you consulted with the artist and showed your design yet? I might be wrong but I’m sorry to say I don’t see this working as a tattoo, at least not the way it is there. Remember, not all images translate to tattoos.

Use unscented soap/lotion. Clean and pat try, do not rub or scratch tattoo. Keep moisturized (I like Aquaphor) but don’t over moisturize. Don’t let it dry out either.
I’d avoid anything on it that would rub, like jeans. I’d wear loose clothing for several weeks. When my boyfriend had his sleeve done he did wrap it during the first few days but with medical gauze, not plastic wrap, just so he could keep it moisturized and not have all of the Aquaphor rub off on his clothes.

I don’t mind negative space in a tattoo but in this case it seems like a bit much, maybe I’m wrong though.

Good for you for being so open to feedback, not everyone is like that. Some people think they know it all and even though they ask for feedback they can’t handle hearing it.
If done properly, negative space can look good in a tattoo but with your design the space is large and critical and a major focal point rather than just an accent so that’s where my concern originates.
If you can, I’d love to see some work or a portfolio by the artist. Post a link if you can. Thanks.

Thanks for the link. Overall looks pretty good, he should do fine with your tattoo. Please keep us updated. Good luck.