Another vote here for Brewferm kits (better than any other kits on the market in my humble opinion) - it was the fantastic quality of those that actually made me take the leap into all-grain brewing. I had been doing kits and extracts off and on for 35 years, then I started brewing Brewferm kits. I was staggered at the improvement in quality, but rather than stop there, I thought "well, if a kit can taste like that, I wonder how much room for further improvement is there if I go all-grain and concentrate on Belgian Trappist beers".
The answer, amazingly, is 'lots'. I am currently (well, not at this precise moment - I'd spill it on my laptop) drinking a Belgian Trappist style beer that I can honestly say is the finest beer I have ever tasted.
I would certainly get a brewing pad/mat or a brewbelt even now, especially with you looking to specialise in Belgian beers. You will possibly want to start their fermentation off at about 18-20C and then gradually crank the temperature up.