If I were you, I'd get a sheer coverage foundation, concealer (if you need it), pressed powder, blusher, mascara and whatever lip product you like.
For foundation, it does depend on your skin type, but most brands have a sheer/light coverage foundation or tinted moisturiser (which are more or less the same as BB, CC, DD and EE creams). Go to the counter, ask for a recommendation and a sample so you can try it at home. Sometimes they do not give samples, but will offer to apply it on your face so you can try it. If you're happy with that, go for it - I personally prefer getting a sample. Give it a few days and buy if you like it.
I have never had issues getting samples from Laura Mercier and Dior, but loads of companies give out samples if you ask for it and they can see you are looking to buy.
I don't use concealer much as I'm useless at it, but I do like the Laura Mercier Secret Camouflage for red patches, spots and so on. Not so much for under eyes though as I think it's too creamy and heavy.
Pressed powder is great as you can take it with you. You can apply it with the powder puff, but it can look cakey, or a brush. I prefer the brush every time - it looks more natural and not so powdery. I like Mac Select Sheer Pressed Powder, but there are loads on the market.
Blusher really is a matter of preference - I like matching my lip product to the blusher, other people go for a blusher in the same colour as they naturally flush, others prefer peachy or pink tones. If you don't know what to go for, ask at the counter what they would recommend. I really like Mac's powder blushers and the people working there have never recommended me something I didn't like.
For mascara it depends on you again. I like tubing mascaras as they do not seem to flake or smudge on me. A cheap one is the L'Oreal beauty tubes mascara in a red and white double ended tube. I don't use the white end, just the actual mascara. A more expensive one I like is the Estee Lauder Double Wear Zero-Smudge Lengthening mascara.
You could have a look on youtube to get ideas and inspiration for products - there are loads of makeup gurus like Lisa Eldridge, Sharon Farrell, Pixiwoo and loads others.