How to care for a toddler and a newborn at the same time?

i just had my baby 4 days ago and i have a 20 month old also. im a single mom and its beginning to get reallly tough. i live with my parents but they dont help me much. we are in the middle of moving so they are either at work or packing everything up. im finding it really hard to do stuff with my toddler while im holding my newborn. and he screams soo much when its bedtime. he is in a toddler bed so he was getting out so many times that i just put a gate infront of his door and after like 30 minutes of crying he fell asleep. what im really worried about is when i have to get up and feed her in the middle of the night and change diapers. last night he only woke up twice while i was doing stuff with her but tonight its different. i have to go downstairs and make a bottle and hopefully he wont scream and wake everyone up and come back upstairs. it just seems really difficult. specially cuz im carrying her everywhere i go. i dont have a swing or bouncer up cuz we are moving everything. i just have the basic playpen and when shes not in that i have to carry her. any advice? im just really nervous about everything