The scarlett solo is a great budget interface for starting out. I've had the 18i20 first gen for about 6 years, and I have no complaints; Scarlett makes great interfaces that are easy to use.
Lite version of ableton will give you four tracks maximum, which is also more than enough for what you want to do. You might want to watch a tutorial or two on youtube though, as getting started with any DAW can be overwhelming at first.
As long as your guitar has a 1/4 inch line input/pickup (aka you're not using a mic for your guitar and another for vocals, as the scarlett solo only has one input for 1/4 and one for XLR), you'll be fine!