Good advice from everyone....
Welshshrek, The first thing you should do is get Molecatchers book, Long Netting from Peg To Peg, It will help you out a lot.
But for the nets you have now, It depends if you want to use the traditional method of end pins and Hazel sticks, or use a quickset basket - For 18yrd nets, I would get a set of end pins for each one, you can get these from Molecatcher or most net sellers etc.
You could if you wanted get a quickset basket, attach some fibreglass poles & do it that way, Its very easy and you could get the hang of it in a few minutes, But