Hello I Want Chooks and welcome to the forum
I am not an expert and I'm sure some more experienced people will be along to advise you. These tips are assuming that you want chickens for eggs and not to raise meat birds. For what it's worth my top ten tips (in no particular order) are -
1) make sure you have enough space. Chickens need at least 2, preferably 3 square metres of ranging space per bird and that doesn't include the space taken by feeders, drinkers and food shelters etc.
2) Better off to start with three point of lay pullets. If any die you don't want to be left with one hen on its own. Hens are flock animals and need company.
3) Keep your feed in galvanised metal bins to make sure rats, mice or squirrels can't get to it.
4) Foxes are cunning. They will have spotted a potential dinner as soon as you move your hens in and will make a point of coming by often to check up. Make sure you have your fox proofing in place. Use weld mesh rather than chicken wire and I find elecrified netting surrounding the range area works for me. Make sure your coop is secure and be prepared to commit yourself to letting your hens out every morning and shutting them in every night. Some people install automatic pop-hole openers.
5) Be ready to bribe neighbours with free eggs and they may be prepared to hen sit for you while you are away
6) You will be needing to keep internal and external parasites at bay. you need to establish a good coop cleaning routine and regularly check for redmite, lice, worms etc. You can use Frontline kitten strength for ticks, leg mites and lice. You can use Flubenvet for worms. These need to be given as part of a regular regime.
7) Before you buy or make a coop consider your needs and setup and you will find plenty of advice here.
Find a local chicken-friendly vet. Not all of them are and some will not even treat chickens.
9) Get a bench or comfortable seat so you can sit and watch your hens.
10) Once you have started be prepared to want to increase your flock. They can become addictive
Good luck and happy chook-keeping.