Congratulations! What an exciting time for you :)
My advice is buy about 20 packs of baby wipes, they will get used eventually and running out of baby wipes is not fun. Have one pack in each room, one under the pushchair one in the car, really useful for blowing his nose, cleaning the cafe floor after meals, cleaning sticky hands and the obvious bum cleaning.
I have a couple of slings and I do enjoy using them around the house, my ring sling is great for when ds wants cuddles but I need to make dinner. I find that I feel more connected with my ds when he is in his parent facing pushchair than when he is in the sling, especially when he's on my back. The great thing about parent facing pushchairs is that you can see what your child is looking at and how they are reacting to a situation and chat about that "yes, that's a very big yellow digger!" "don't worry that dog is big, but he looks friendly" at 10 months he's likely to be not saying alot and I found it hard to read ny child without seeing his facial expressions.
If he is used to swimming pools maybe a reusable swimming nappy, lovely chance for skin to skin, but avoid weekends, especially rainy weekends as it might be a bit manic.
We find our video monitor very useful, we used to have a sound monitor but the problem we had was we went in everytime he made a sound and we were actually waking him up, with tge video monitor we can check that he's ok/happy/not learnt to climb out of the cot without actually disturbing him.
I think 10 months is the time when babies development varies the most, some 10 month olds walk, say a couple of words, some 10 month olds are much more like little babies. Even if your ds isn't mobile yet I think it's never too early to put up safety gates/locks on draws and move dangerous things high up as the day they do become mobile you won't have time to do all the safety things as you'll be too busy chasing him around!
Take tons of photos, I always think a stage is going to last forever but things change so fast! I also write a monthly update for my ds, just a quick note of the new things he has learnt, the firsts and any funny stories. I really love reading these back and I think he'll enjoy them when he's older.
Best of luck!