For the caravan itself, most static units come with a cooker, fridge and basic kitchen equipment, but tea towels, washing-up liquid and bin bags are worth throwing in your bag rather than assuming they'll be there. A torch is genuinely useful for evening walks back from the clubhouse, and a few games or a pack of cards cover the odd wet afternoon without anyone reaching for a screen.
Finally, ask about parking, whether each unit has its own space or whether you're sharing a car park a short walk away, particularly if you're arriving with a car full of luggage and a young family in tow.
There isn't one single answer to how far ahead you should book, because it depends heavily on when you actually want to go.
The first thing to check is whether you can move outside a Friday-to-Friday or Saturday-to-Saturday week. Many parks release short breaks, three or four nights rather than a full week, and these tend to have more late availability simply because fewer people search for them. If your dates can flex by even a day or two, you'll usually see more choice.
On the budget side, self-catering works in your favour with a bigger group. Cooking most meals in the caravan rather than eating out as a party of eight or ten keeps costs sensible, and splitting the shopping and cooking between the adults spreads both the effort and the spend. A shared static
coastal caravan holidays holiday, or two units booked close together, usually works out considerably more cost-effective than the equivalent number of hotel rooms plus regular restaurant bills.
On-site facilities are worth checking properly rather than assuming. Look at what's actually included in your stay versus what costs extra, whether the pool, if there is one, is heated and what hours it runs, and whether there's anywhere on site to eat if you don't fancy cooking every night.