the best way to proceed is to determine what style and medium you are using, wether it be acrylic paints or oils or even water colour. it is simply straight forward. paint it exactly how you see it. or if you are not working from reference material, then paint it how you see it in your mind. use your imagination. if you are using oil or acrylic; i don't know how much experience you have with either or if you have none, it would be good, if you don't , to research the medium and materials. you may eithe start by doing an outline lightly on your surface to guide you and paint it in from there. or you can work it in in layers. first: do your background and lay in all the relative imagery from the background. second; then use the color that you would be useing for the tree trunk and branches and let dry. third then you lay over the leaves and blossoms in the appropriate colours of your choice. I don't know of you are doing a far -off or close up. but if for close -up you should off course work in the details. if for far off you should use the stippling technic for the tree. for water colours; do a drawing lightly on your stretched water colour paper in a hard HB drawing pencil. then work in your colours from light to dark, gradually getting darker as you go as you can layer and over lap the colours to make them more intense.