Welcome Colin .
Wheels are a bit scarce as an odd offset and most fit old Azev styles .It's a case of keeping an eye out on Ebay for something close and making them fit ...adapter plates and/or machining .
Parts always best to shout out on here first beforehand and beware of some listings as a lot are incorrect .
Basic service items are easy enough to find from the local factors ,you just need to cross ref to others Renaults .Again shout up on here for the codes etc .
Nearest specialist to you is in Belfast
Or next in Derbyshire
Performance upgrades ...first off I'd service it ,change all filters ,plugs etc and then use it for a while to shakedown any electrical gremlins ...Make sure all sensors are doing what they should .
Any problems then here is the best place to ask .