If you go to Boots/John Lewis or the like, they have branded stands with sales assistants on each stand.
These are, for example, YSL, Charlotte Tilbury, Channel, and so on.
Choose one you would like and book an appointment with them to have a makeover so you can see what they do.
You usually get a voucher for money off their products or/and no charge for the makeover if you buy a product/s.
That way, you can see what works for you, buy one item, and look around then for cheaper products, if you wish, with the template they give you on how to make up
My brands I love and use are YSL and Charlotte Tilbury. I also use Daniel Sandler watercolour blush and Dermalogica primer skin perfect.
My routine is eyeliner pencil, concealer on eyes, for base, very pale beige over whole eyelid, then a mix of colours blended on the lower lid.
Mascara (I like Jane Iredale) then eyebrow pencil, followed by face primer (dermalogica skin perfect), foundation, concealer under eyes (YSL) liquid watercolour blusher (Daniel Sandler) then bronzer, and a touch of powder gently dabbed on with a brush at different points on my face, finished with lip balm in the day and lipstick on a night out.
I finish off with an SPF setting spray. I use the Garnier SPF spray.
I hope that helps