I usually do 3 courses then coffee with cheese, chocolates, etc.
Don't put yourself through stress though. I often make 2 courses and assemble one so make the main and one of starter or dessert
Assembled starters could be a selection of nice breads, olives, cold meats, pates, etc. Lots of stuff to pick at and nibble, often helps to relax everybody and get people chatting too. Homemade could be a soup, terrine or pate.
Delia does some lovely recipes that cook in one dish like spanish chicken, moroccan chicken, etc which are great if you are quite new to catering for others as you aren't faffing around with timings. Look great in a big oven to tableware dish, served with a nice green salad. Google her Salmon Coulibiac, that is amazing. I often arrange sliced tomatoes and cucumber on a large plate, drizzle with olive oil and sprinkle with chopped herbs, looks more impressive than plain salad.
Dessert, whatever I do I always put out a fresh fruit salad or berries with it. Could be cheesecake or similar. Chocolate and pear tart is a nice warm one. You can also make a melted hot chocolate sauce and serve it with fruit and biscuits like a fondue.
I buy a few cheeses and some nice chocolates and sweets to go with coffee and liqueurs.
I love dinner parties!