One way I like to start is by taking a paper grocery bag and a garbage bag, and I walk through each room looking for things to either throw away or recycle. Once I've taken away those two mess-makers, then the rest of it seems way less overwhelming.

In terms of the kitchen, I always follow this sequence. If I work out of sequcne, I can't do it:
1) throw away any garbage or bottles that are on the counters or table
2) put away whatever dishes are clean from the dishwasher or dishrack
3) fill the dishwasher
4) wipe the counters and stove
5) go through the fridge and clean out whatever isn't edible
6) put resulting dishes in the dishwasher
7) wipe the fridge shelves
8) rewipe the counters, wash the sink, and replace the dishrags and sponge with clean ones

For the bedrooms, I:
1) change the sheets
2) make the bed (I cannot clean a bedroom if the bed isn't made -- doesn't work for me)
3) gather all dirty laundry and get it out of the bedroom
4) fold all clean laundry and put it away
5) dust and sweep

It's got to be in that sequence, because there is always a beginning and an end to each step.

I am sorry it feels so overwhelming. I know it's not fun. You were smart to pick the smallest room first.

Good luck... you can do this!