My only advice is to try and get the toddler to help you with bathing and dressing the baby. Make them involved and keeps them out of trouble. I’m lucky that my little girl can just be dropped in her cot and she will chill and get herself to sleep but I have had a few stressful bedtimes! X
My partner works shifts so I do a lot of bedtimes on my own with 2 little ones, it definitely gets easier! 2 weeks is so early and baby wont have any kind of routine yet, we are now 11 weeks and it's got so much easier! It's just trial and error what works at first but you will get there