Little and often is the key, saves having to spend hours deep cleaning things. You can't clean clutter (flylady) so you do need to declutter if you need to, again, little and often is fine. I found someone on IG who gets rid (either rubbish, charity shop, sell or give away) of two things every day and even over a couple of months it's made a huge difference to her house.
With cleaning, don't think you need lots of products, and if you have asthma (even very mild) be careful what you use. I can't use viakal or the popular wild rhubarb method spray as an example.
With bathrooms, I 'swish and swipe' every day which means after I clean my face I give the sink a wipe over (sometimes with a spray, sometimes not) and the loo gets a wipe over with a toilet wipe and squirt of cleaner every day. We have a method shower spray but I think I'm the only one who actually uses it. Once a week, proper clean of the bathroom and I use Ecover limescale spray and the scrubby side of a sponge to do the shower doors.
Kitchen gets cleaned as I go. When you start cooking, fill up the washing up bowl and wash up bits as you use them, this can help avoid the big clear up afterwards when you just want to go sit on the sofa!
Handheld hoover is fab, although I clean better with the big hoover as I use the hose to go round the ceiling edges and under furniture.
Once a month use a dishwasher cleaner and one for the washing machine (leave drawer and door ajar when not in use, helps stop it going musty). Also wash the (washable) front and back door mats.
Window cleaner comes every eight weeks roughly, which is my cue to do the inside windows and the wooden blinds in the living room (my least favourite job!)
However, we're a family of five, so with less in your household you may find you don't need to clean as deeply as often. Flylady says 'good enough is good enough' so remember you're not aiming for perfection. My motto is 'basically clean and relatively tidy' 
good luck OP, slow and steady wins the race, and anything is better than nothing.