Home service?

I'm going to try a home service on my Picasso C3 2016 Hdi diesel . Can anyone please advise on what I need?

What oil is suggested?
What oil filter
What brake fluid (I'm thinking of a partial change with a Turkey baster method.)
What air filter?

I think anything else would be beyond me. If anyone can give me a steer on the items mentioned, I'll get the bit ordered

I hate to be a Harpee but you need to direct your questions to the relevant areas.
I am not doing this to be an officious @$$hole, but to help you and future members in case your thread has something of interest to them.
It fragments where stuff can be found on the site if it's not where it should be.
You should break your questions down and start a new topic for each part of the question. That way you can have a more in-depth discussion about the separate parts. For example 'oil' might attract a few comments. But there is a difference between the oil used in petrol and diesel engines.
Multiple questions "bog down" and over complicate a thread.
At the top of each area are the "forum rules" and what should be posted there.
I also appreciate that you may not know what the correct area is.
Your engine oil and oil filter are specific to a diesel engine and should be directed there. If you do a search in that area you might find a thread already exists.
The brake fluid and (perhaps) the air filter are generic, so here is the correct area.
Please include your VIN as things like oil filters change over time.
No disrespect intended. Thank you.

I suggest you take the car to a local mechanic and ask them to quote you for the work.

Using a turkey baster is not the way to renew the brake fluid.

Ok I'll kick things off with your brake fluid question.
Brake fluid is specified by its boiling point and it's mixture. Typically its a glycol/ester mixture.
DOT3 boils at a lower temperature than DOT4. DOT4 boils at a lower temperature than DOT5.1. DO NOT USE DOT 5 if you find it! DOT 5.1 is OK.
The specification for your car will be DOT4.
The brand and colour are irrelevant! However I prefer the amber colour because you can see that's it's 'off' when it becomes discoloured. Other colours can be blue or green.
I don't recommend a partial fluid change. You might still have bad fluid in the rest of the lines. And moisture finds it's way the to the lower parts of the system.
In the auto shops and online you will find these pen-like brake fluid testers. For the most part they are cheap but pretty good. However you should test the tester from time to time.
Fill the cap of a new bottle of brake fluid and dip the probes of the tester in the fluid of the cap (read the directions for the tester first). Of course the new bottle of fluid should pass. Then add 1 drop of tap water to the cap of fluid and mix it up. Now test it again. The tester should fail the mixture. Discard the cap fluid and dry the cap before recapping the brake fluid bottle.
Clean and dry the testor probes and test the fluid in your brake fluid reservoir. If it passes, leave it alone. If it fails change it all or get it changed. Test all bottles of opened fluid before using it in your car. The brake fluid can absorb moisture from the atmosphere if the bottles are not sealed completely.
NEVER 'TOP UP' YOUR BRAKE RESERVOIR just because it's low! If the fluid is low...investigate. Typically it's because your brake shoes or pads are worn...replace them. If you have a leak...fix it.

LOL! A 'turkey baster' is Ok to remove the fluid from a reservoir, so long as it's clean, dry and has not been used for any other purpose. But as I said you would only use it when you are replacing the entire contents of the brake system.

I'm grateful to the people that took the time to reply to my thread, and not offended at all. Being new to the forum, finding your way around is not that easy, but I'll work on it thanks. I did not know i would have to ask 4/5 question, one each item like best oil, oil filter so on. I do my best thanks all.

In the auto shops and online you will find these pen-like brake fluid testers

Which is fine until you come up against the guy that previously turkey basted the brake fluid reservoir. The calipers and clutch will still have old fluid yet the test will pass from that new fluid in the sample.

You can't trust a previous owner

NEVER 'TOP UP' YOUR BRAKE RESERVOIR just because it's low! If the fluid is low...investigate. Typically it's because your brake shoes or pads are worn...replace them. If you have a leak...fix it.

This could have its own post in the tips section

The rear drums wheel cylinders are silent leakers. Go there first if you have a disappearing brake fluid level