Welcome to the forum.
I too started with an RTR 'Southampton' just to see if I'd enjoy sailing it - I did! (Well, I suppose I should say that I really started as a kid driving my Dad's 1:1 real 163 ton twin screw tug! I was going to follow in his footsteps and gain four gold rings on my sleeve too, but that's another story!)
My modelling skills weren't great and RSI and a touch of arthritis didn't help. So instead of building a boat from a kit or from scratch, I decided to buy a second hand boat that was in sore need of some serious TLC. It was a very dilapidated 'Smit Nederland' and over a Winter it was rebuilt internally (only the motors and propshafts stayed in place), with all the electronics completely replaced. Externally, a complete strip and repaint, extra details added and she became fully illuminated, inside and out. I was very pleased with what I could do with even my limited skills. Photo of final result attached.
Great fun sailing her on the lake and in the next Winter I added a bow thruster. Even more fun on the lake. I can do all the things I used to do with the real full sized tug.
Currently in dry dock awaiting repairs to a broken rudder and Kort nozzle support. Beyond my skill set so I'll visit a friend who is an expert. He'll sort that and repack the propshafts in no time at all.
So if you're unsure and don't want to go for an RTR, I'd recommend looking for a used model that you can repair/refurbish/repaint and make 'yours'. I'd second the suggestion of joining a local club and this may well pay dividends, as there may be something for sale that takes your fancy.